diff --git a/README-cn.md b/README-cn.md
index f857f2eb..f6f1fe21 100644
--- a/README-cn.md
+++ b/README-cn.md
@@ -119,6 +119,10 @@ Step 4: Enjoy coding
 
 ## Latest examples
 
+### CheckComboBox
+
+![CheckComboBox](https://gitee.com/handyorg/HandyOrgResource/raw/master/HandyControl/Resources/CheckComboBox.png)
+
 ### ImageSelector
 
 ![ImageSelector](https://gitee.com/handyorg/HandyOrgResource/raw/master/HandyControl/Resources/ImageSelector.png)
@@ -135,12 +139,12 @@ Step 4: Enjoy coding
 
 ![GooeyEffect](https://gitee.com/handyorg/HandyOrgResource/raw/master/HandyControl/Resources/GooeyEffect.gif)
 
+## History publication
+
 ### GlowWindow
 
 ![GlowWindow](https://gitee.com/handyorg/HandyOrgResource/raw/master/HandyControl/Resources/GlowWindow.png)
 
-## History publication
-
 ### FlowDocumentScrollViewerStyle
 
 ![FlowDocumentScrollViewerStyle](https://gitee.com/handyorg/HandyOrgResource/raw/master/HandyControl/Resources/FlowDocumentScrollViewer.png)
diff --git a/README.md b/README.md
index 8625625f..c5bb1625 100644
--- a/README.md
+++ b/README.md
@@ -119,6 +119,10 @@ Step 4: Enjoy coding
 
 ## Latest examples
 
+### CheckComboBox
+
+![CheckComboBox](https://raw.githubusercontent.com/HandyOrg/HandyOrgResource/master/HandyControl/Resources/CheckComboBox.png)
+
 ### ImageSelector
 
 ![ImageSelector](https://raw.githubusercontent.com/HandyOrg/HandyOrgResource/master/HandyControl/Resources/ImageSelector.png)
@@ -135,12 +139,12 @@ Step 4: Enjoy coding
 
 ![GooeyEffect](https://raw.githubusercontent.com/HandyOrg/HandyOrgResource/master/HandyControl/Resources/GooeyEffect.gif)
 
+## History publication
+
 ### GlowWindow
 
 ![GlowWindow](https://raw.githubusercontent.com/HandyOrg/HandyOrgResource/master/HandyControl/Resources/GlowWindow.png)
 
-## History publication
-
 ### FlowDocumentScrollViewerStyle
 
 ![FlowDocumentScrollViewerStyle](https://raw.githubusercontent.com/HandyOrg/HandyOrgResource/master/HandyControl/Resources/FlowDocumentScrollViewer.png)
diff --git a/src/Shared/HandyControlDemo_Shared/UserControl/Controls/CheckComboBoxDemoCtl.xaml b/src/Shared/HandyControlDemo_Shared/UserControl/Controls/CheckComboBoxDemoCtl.xaml
index 6487bf79..4a10a841 100644
--- a/src/Shared/HandyControlDemo_Shared/UserControl/Controls/CheckComboBoxDemoCtl.xaml
+++ b/src/Shared/HandyControlDemo_Shared/UserControl/Controls/CheckComboBoxDemoCtl.xaml
@@ -1,14 +1,33 @@
 <UserControl x:Class="HandyControlDemo.UserControl.CheckComboBoxDemoCtl"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             DataContext="{Binding ComboBoxDemo,Source={StaticResource Locator}}"
+             xmlns:langs="clr-namespace:HandyControlDemo.Properties.Langs"
+             xmlns:ex="clr-namespace:HandyControlDemo.Tools.Extension"
              xmlns:hc="https://handyorg.github.io/handycontrol"
              Background="{DynamicResource RegionBrush}">
     <hc:TransitioningContentControl>
-        <hc:CheckComboBox VerticalAlignment="Top" Margin="32" ShowSelectAllButton="True" Width="180">
-            <hc:CheckComboBoxItem Content="111"/>
-            <hc:CheckComboBoxItem Content="222"/>
-            <hc:CheckComboBoxItem Content="333"/>
-            <hc:CheckComboBoxItem Content="444"/>
-        </hc:CheckComboBox>
+        <StackPanel Margin="32" Orientation="Horizontal">
+            <StackPanel>
+                <hc:CheckComboBox ShowClearButton="True" MaxWidth="380" ItemsSource="{Binding DataList}" ShowSelectAllButton="True"/>
+                <hc:CheckComboBox MaxWidth="380" ItemsSource="{Binding DataList}" Style="{StaticResource CheckComboBoxExtend}" Margin="0,16,0,0"  IsEnabled="False" ShowSelectAllButton="True"/>
+
+                <hc:CheckComboBox ShowClearButton="True" MaxWidth="380" ItemsSource="{Binding DataList}" Style="{StaticResource CheckComboBoxExtend}" hc:InfoElement.Title="{ex:Lang Key={x:Static langs:LangKeys.TitleDemoStr1}}" Margin="0,32,0,0" ShowSelectAllButton="True"/>
+                <hc:CheckComboBox MaxWidth="380" ItemsSource="{Binding DataList}" hc:InfoElement.Placeholder="{ex:Lang Key={x:Static langs:LangKeys.PlsEnterContent}}" hc:InfoElement.Title="{ex:Lang Key={x:Static langs:LangKeys.TitleDemoStr2}}" Style="{StaticResource CheckComboBoxExtend}" hc:InfoElement.Necessary="True" Margin="0,16,0,0"/>
+
+                <hc:CheckComboBox ShowClearButton="True" Width="380" ItemsSource="{Binding DataList}" hc:InfoElement.TitleWidth="140" hc:InfoElement.TitlePlacement="Left" Style="{StaticResource CheckComboBoxExtend}" hc:InfoElement.Title="{ex:Lang Key={x:Static langs:LangKeys.TitleDemoStr3}}" Margin="0,32,0,0" ShowSelectAllButton="True"/>
+                <hc:CheckComboBox Width="380" ItemsSource="{Binding DataList}" hc:InfoElement.TitleWidth="140" hc:InfoElement.TitlePlacement="Left" hc:InfoElement.Placeholder="{ex:Lang Key={x:Static langs:LangKeys.PlsEnterContent}}" hc:InfoElement.Title="{ex:Lang Key={x:Static langs:LangKeys.TitleDemoStr3}}" Style="{StaticResource CheckComboBoxExtend}" hc:InfoElement.Necessary="True" Margin="0,16,0,0"/>
+            </StackPanel>
+            <StackPanel Margin="32,0,0,0">
+                <hc:CheckComboBox ShowClearButton="True" MaxWidth="380" ItemsSource="{Binding DataList}" Style="{StaticResource CheckComboBoxPlus}" ShowSelectAllButton="True"/>
+                <hc:CheckComboBox MaxWidth="380" ItemsSource="{Binding DataList}" Margin="0,16,0,0" IsEnabled="False" Style="{StaticResource CheckComboBoxPlus}"/>
+
+                <hc:CheckComboBox MaxWidth="380" ShowClearButton="True" ItemsSource="{Binding DataList}" Style="{StaticResource CheckComboBoxPlus}" hc:InfoElement.Title="{ex:Lang Key={x:Static langs:LangKeys.TitleDemoStr1}}" Margin="0,32,0,0" ShowSelectAllButton="True"/>
+                <hc:CheckComboBox MaxWidth="380" ItemsSource="{Binding DataList}" hc:InfoElement.Placeholder="{ex:Lang Key={x:Static langs:LangKeys.PlsEnterContent}}" hc:InfoElement.Title="{ex:Lang Key={x:Static langs:LangKeys.TitleDemoStr2}}" Style="{StaticResource CheckComboBoxPlus}" hc:InfoElement.Necessary="True" Margin="0,16,0,0"/>
+
+                <hc:CheckComboBox MaxWidth="380" ItemsSource="{Binding DataList}" ShowClearButton="True" Width="380" hc:InfoElement.TitleWidth="140" hc:InfoElement.TitlePlacement="Left" Style="{StaticResource CheckComboBoxPlus}" hc:InfoElement.Title="{ex:Lang Key={x:Static langs:LangKeys.TitleDemoStr3}}" Margin="0,32,0,0" ShowSelectAllButton="True"/>
+                <hc:CheckComboBox MaxWidth="380" ItemsSource="{Binding DataList}" Width="380" hc:InfoElement.TitleWidth="140" hc:InfoElement.TitlePlacement="Left" hc:InfoElement.Placeholder="{ex:Lang Key={x:Static langs:LangKeys.PlsEnterContent}}" hc:InfoElement.Title="{ex:Lang Key={x:Static langs:LangKeys.TitleDemoStr3}}" Style="{StaticResource CheckComboBoxPlus}" hc:InfoElement.Necessary="True" Margin="0,16,0,0"/>
+            </StackPanel>
+        </StackPanel>
     </hc:TransitioningContentControl>
 </UserControl>
diff --git a/src/Shared/HandyControlDemo_Shared/UserControl/Controls/WindowDemoCtl.xaml b/src/Shared/HandyControlDemo_Shared/UserControl/Controls/WindowDemoCtl.xaml
index 66837b23..cbbe9643 100644
--- a/src/Shared/HandyControlDemo_Shared/UserControl/Controls/WindowDemoCtl.xaml
+++ b/src/Shared/HandyControlDemo_Shared/UserControl/Controls/WindowDemoCtl.xaml
@@ -17,9 +17,7 @@
             <Button Click="ButtonCustomContent_OnClick" Content="{ex:Lang Key={x:Static langs:LangKeys.OpenCustomContentWindow}}"/>
             <Button Name="ButtonMouseFollow" Click="ButtonMouseFollow_OnClick" Content="{ex:Lang Key={x:Static langs:LangKeys.OpenMouseFollowWindow}}"/>
             <Button Command="{Binding OpenWindowCmd}" CommandParameter="{x:Static data:MessageToken.NoNonClientAreaDragableWindow}" Content="{ex:Lang Key={x:Static langs:LangKeys.OpenNoNonClientAreaDragableWindow}}"/>
-            <hc:Badge Text="New" Style="{StaticResource BadgeDanger}" VerticalAlignment="Center" HorizontalAlignment="Center" BadgeMargin="0,-10,-20,0">
-                <Button Command="{Binding OpenWindowCmd}" CommandParameter="{x:Static data:MessageToken.GlowWindow}" Content="{ex:Lang Key={x:Static langs:LangKeys.OpenGlowWindow}}"/>
-            </hc:Badge>
+            <Button Command="{Binding OpenWindowCmd}" CommandParameter="{x:Static data:MessageToken.GlowWindow}" Content="{ex:Lang Key={x:Static langs:LangKeys.OpenGlowWindow}}"/>
         </UniformGrid>
     </hc:TransitioningContentControl>
 </UserControl>
diff --git a/src/Shared/HandyControl_Shared/Controls/Input/CheckComboBox/CheckComboBox.cs b/src/Shared/HandyControl_Shared/Controls/Input/CheckComboBox/CheckComboBox.cs
index f7a87396..edd3f495 100644
--- a/src/Shared/HandyControl_Shared/Controls/Input/CheckComboBox/CheckComboBox.cs
+++ b/src/Shared/HandyControl_Shared/Controls/Input/CheckComboBox/CheckComboBox.cs
@@ -1,13 +1,16 @@
-using System.Windows;
+using System;
+using System.ComponentModel;
+using System.Windows;
 using System.Windows.Controls;
-using System.Windows.Controls.Primitives;
+using System.Windows.Input;
 using HandyControl.Data;
+using HandyControl.Interactivity;
 
 namespace HandyControl.Controls
 {
     [TemplatePart(Name = ElementPanel, Type = typeof(Panel))]
     [TemplatePart(Name = ElementSelectAll, Type = typeof(CheckComboBoxItem))]
-    public class CheckComboBox : ListBox
+    public class CheckComboBox : ListBox, IDataInput
     {
         private const string ElementPanel = "PART_Panel";
 
@@ -15,12 +18,58 @@ namespace HandyControl.Controls
 
         private Panel _panel;
 
-        private Popup _popup;
-
         private CheckComboBoxItem _selectAllItem;
 
         private bool _isInternalAction;
 
+        public static readonly DependencyProperty IsErrorProperty = DependencyProperty.Register(
+            "IsError", typeof(bool), typeof(CheckComboBox), new PropertyMetadata(ValueBoxes.FalseBox));
+
+        public bool IsError
+        {
+            get => (bool) GetValue(IsErrorProperty);
+            set => SetValue(IsErrorProperty, ValueBoxes.BooleanBox(value));
+        }
+
+        public static readonly DependencyProperty ErrorStrProperty = DependencyProperty.Register(
+            "ErrorStr", typeof(string), typeof(CheckComboBox), new PropertyMetadata(default(string)));
+
+        public string ErrorStr
+        {
+            get => (string) GetValue(ErrorStrProperty);
+            set => SetValue(ErrorStrProperty, value);
+        }
+
+        public static readonly DependencyProperty TextTypeProperty = DependencyProperty.Register(
+            "TextType", typeof(TextType), typeof(CheckComboBox), new PropertyMetadata(default(TextType)));
+
+        public TextType TextType
+        {
+            get => (TextType) GetValue(TextTypeProperty);
+            set => SetValue(TextTypeProperty, value);
+        }
+
+        public static readonly DependencyProperty ShowClearButtonProperty = DependencyProperty.Register(
+            "ShowClearButton", typeof(bool), typeof(CheckComboBox), new PropertyMetadata(ValueBoxes.FalseBox));
+
+        public bool ShowClearButton
+        {
+            get => (bool) GetValue(ShowClearButtonProperty);
+            set => SetValue(ShowClearButtonProperty, ValueBoxes.BooleanBox(value));
+        }
+
+        public static readonly DependencyProperty MaxDropDownHeightProperty =
+            System.Windows.Controls.ComboBox.MaxDropDownHeightProperty.AddOwner(typeof(CheckComboBox),
+                new FrameworkPropertyMetadata(SystemParameters.PrimaryScreenHeight / 3));
+
+        [Bindable(true), Category("Layout")]
+        [TypeConverter(typeof(LengthConverter))]
+        public double MaxDropDownHeight
+        {
+            get => (double) GetValue(MaxDropDownHeightProperty);
+            set => SetValue(MaxDropDownHeightProperty, value);
+        }
+
         public static readonly DependencyProperty IsDropDownOpenProperty = DependencyProperty.Register(
             "IsDropDownOpen", typeof(bool), typeof(CheckComboBox), new PropertyMetadata(ValueBoxes.FalseBox));
 
@@ -48,7 +97,11 @@ namespace HandyControl.Controls
             set => SetValue(ShowSelectAllButtonProperty, ValueBoxes.BooleanBox(value));
         }
 
-        public CheckComboBox() => AddHandler(Controls.Tag.ClosedEvent, new RoutedEventHandler(Tags_OnClosed));
+        public CheckComboBox()
+        {
+            AddHandler(Controls.Tag.ClosedEvent, new RoutedEventHandler(Tags_OnClosed));
+            CommandBindings.Add(new CommandBinding(ControlCommands.Clear, (s, e) => SelectedItems.Clear()));
+        }
 
         private void Tags_OnClosed(object sender, RoutedEventArgs e)
         {
@@ -77,14 +130,48 @@ namespace HandyControl.Controls
             }
         }
 
+        public bool VerifyData()
+        {
+            OperationResult<bool> result;
+
+            if (VerifyFunc != null)
+            {
+                result = VerifyFunc.Invoke(null);
+            }
+            else
+            {
+                if (SelectedItems.Count > 0)
+                {
+                    result = OperationResult.Success();
+                }
+                else if (InfoElement.GetNecessary(this))
+                {
+                    result = OperationResult.Failed(Properties.Langs.Lang.IsNecessary);
+                }
+                else
+                {
+                    result = OperationResult.Success();
+                }
+            }
+
+            IsError = !result.Data;
+            ErrorStr = result.Message;
+            return result.Data;
+        }
+
+        public Func<string, OperationResult<bool>> VerifyFunc { get; set; }
+
         private void SwitchAllItems(bool selected)
         {
             if (_isInternalAction) return;
             _isInternalAction = true;
 
-            foreach (CheckComboBoxItem item in ItemContainerGenerator.Items)
+            foreach (var item in ItemContainerGenerator.Items)
             {
-                item.SetCurrentValue(ListBoxItem.IsSelectedProperty, selected);
+                if (ItemContainerGenerator.ContainerFromItem(item) is CheckComboBoxItem checkComboBoxItem)
+                {
+                    checkComboBoxItem.SetCurrentValue(ListBoxItem.IsSelectedProperty, selected);
+                }
             }
 
             _isInternalAction = false;
@@ -98,12 +185,18 @@ namespace HandyControl.Controls
         protected override void OnSelectionChanged(SelectionChangedEventArgs e)
         {
             UpdateTags();
+            VerifyData();
+
             base.OnSelectionChanged(e);
         }
 
+        protected override bool IsItemItsOwnContainerOverride(object item) => item is CheckComboBoxItem;
+
+        protected override DependencyObject GetContainerForItemOverride() => new CheckComboBoxItem();
+
         private void UpdateTags()
         {
-            if (_isInternalAction) return;
+            if (_panel == null || _isInternalAction) return;
 
             if (_selectAllItem != null)
             {
diff --git a/src/Shared/HandyControl_Shared/HandyControl_Shared.projitems b/src/Shared/HandyControl_Shared/HandyControl_Shared.projitems
index edf474c4..00b8950f 100644
--- a/src/Shared/HandyControl_Shared/HandyControl_Shared.projitems
+++ b/src/Shared/HandyControl_Shared/HandyControl_Shared.projitems
@@ -118,6 +118,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Converter\DoubleMinConverter.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Converter\Number2PercentageConverter.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Converter\Object2StringConverter.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Tools\Converter\Object2VisibilityReConverter.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Converter\RectangleCircularConverter.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Converter\ThicknessSplitConverter.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Extension\DependencyObjectExtension.cs" />
diff --git a/src/Shared/HandyControl_Shared/Properties/Langs/Lang.Designer.cs b/src/Shared/HandyControl_Shared/Properties/Langs/Lang.Designer.cs
index dc9c63af..06b51481 100644
--- a/src/Shared/HandyControl_Shared/Properties/Langs/Lang.Designer.cs
+++ b/src/Shared/HandyControl_Shared/Properties/Langs/Lang.Designer.cs
@@ -59,7 +59,18 @@ namespace HandyControl.Properties.Langs {
                 resourceCulture = value;
             }
         }
-        
+
+        /// <summary>
+        ///   查找类似 所有 的本地化字符串。
+        /// </summary>
+        public static string All
+        {
+            get
+            {
+                return ResourceManager.GetString("All", resourceCulture);
+            }
+        }
+
         /// <summary>
         ///   查找类似 上午 的本地化字符串。
         /// </summary>
diff --git a/src/Shared/HandyControl_Shared/Properties/Langs/Lang.en.resx b/src/Shared/HandyControl_Shared/Properties/Langs/Lang.en.resx
index d9294600..b12aa4f1 100644
--- a/src/Shared/HandyControl_Shared/Properties/Langs/Lang.en.resx
+++ b/src/Shared/HandyControl_Shared/Properties/Langs/Lang.en.resx
@@ -237,4 +237,7 @@
   <data name="Miscellaneous" xml:space="preserve">
     <value>Miscellaneous</value>
   </data>
+  <data name="All" xml:space="preserve">
+    <value>All</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/src/Shared/HandyControl_Shared/Properties/Langs/Lang.fa.resx b/src/Shared/HandyControl_Shared/Properties/Langs/Lang.fa.resx
index 5d89a3fb..aa869a08 100644
--- a/src/Shared/HandyControl_Shared/Properties/Langs/Lang.fa.resx
+++ b/src/Shared/HandyControl_Shared/Properties/Langs/Lang.fa.resx
@@ -237,4 +237,7 @@
   <data name="Miscellaneous" xml:space="preserve">
     <value>Miscellaneous</value>
   </data>
+  <data name="All" xml:space="preserve">
+    <value>All</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/src/Shared/HandyControl_Shared/Properties/Langs/Lang.fr.resx b/src/Shared/HandyControl_Shared/Properties/Langs/Lang.fr.resx
index 3244677f..14180e25 100644
--- a/src/Shared/HandyControl_Shared/Properties/Langs/Lang.fr.resx
+++ b/src/Shared/HandyControl_Shared/Properties/Langs/Lang.fr.resx
@@ -237,4 +237,7 @@
   <data name="Miscellaneous" xml:space="preserve">
     <value>Miscellaneous</value>
   </data>
+  <data name="All" xml:space="preserve">
+    <value>All</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/src/Shared/HandyControl_Shared/Properties/Langs/Lang.ko-KR.resx b/src/Shared/HandyControl_Shared/Properties/Langs/Lang.ko-KR.resx
index 2b5b057b..74be0fba 100644
--- a/src/Shared/HandyControl_Shared/Properties/Langs/Lang.ko-KR.resx
+++ b/src/Shared/HandyControl_Shared/Properties/Langs/Lang.ko-KR.resx
@@ -237,4 +237,7 @@
   <data name="Miscellaneous" xml:space="preserve">
     <value>Miscellaneous</value>
   </data>
+  <data name="All" xml:space="preserve">
+    <value>All</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/src/Shared/HandyControl_Shared/Properties/Langs/Lang.pt-BR.resx b/src/Shared/HandyControl_Shared/Properties/Langs/Lang.pt-BR.resx
index 9e82b831..724099b7 100644
--- a/src/Shared/HandyControl_Shared/Properties/Langs/Lang.pt-BR.resx
+++ b/src/Shared/HandyControl_Shared/Properties/Langs/Lang.pt-BR.resx
@@ -237,4 +237,7 @@
   <data name="Miscellaneous" xml:space="preserve">
     <value>Geral</value>
   </data>
+  <data name="All" xml:space="preserve">
+    <value>All</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/src/Shared/HandyControl_Shared/Properties/Langs/Lang.resx b/src/Shared/HandyControl_Shared/Properties/Langs/Lang.resx
index 7d98ff34..5b9d9f8d 100644
--- a/src/Shared/HandyControl_Shared/Properties/Langs/Lang.resx
+++ b/src/Shared/HandyControl_Shared/Properties/Langs/Lang.resx
@@ -237,4 +237,7 @@
   <data name="Miscellaneous" xml:space="preserve">
     <value>杂项</value>
   </data>
+  <data name="All" xml:space="preserve">
+    <value>全部</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/src/Shared/HandyControl_Shared/Properties/Langs/Lang.ru.resx b/src/Shared/HandyControl_Shared/Properties/Langs/Lang.ru.resx
index 4b8c4285..35b6367a 100644
--- a/src/Shared/HandyControl_Shared/Properties/Langs/Lang.ru.resx
+++ b/src/Shared/HandyControl_Shared/Properties/Langs/Lang.ru.resx
@@ -237,4 +237,7 @@
   <data name="Miscellaneous" xml:space="preserve">
     <value>Miscellaneous</value>
   </data>
+  <data name="All" xml:space="preserve">
+    <value>All</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/src/Shared/HandyControl_Shared/Properties/Langs/Lang.tr.resx b/src/Shared/HandyControl_Shared/Properties/Langs/Lang.tr.resx
index 1ee2f1af..ea40fa6f 100644
--- a/src/Shared/HandyControl_Shared/Properties/Langs/Lang.tr.resx
+++ b/src/Shared/HandyControl_Shared/Properties/Langs/Lang.tr.resx
@@ -237,4 +237,7 @@
   <data name="Miscellaneous" xml:space="preserve">
     <value>Miscellaneous</value>
   </data>
+  <data name="All" xml:space="preserve">
+    <value>All</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/src/Shared/HandyControl_Shared/Properties/Langs/LangProvider.cs b/src/Shared/HandyControl_Shared/Properties/Langs/LangProvider.cs
index 9f52f043..5302237c 100644
--- a/src/Shared/HandyControl_Shared/Properties/Langs/LangProvider.cs
+++ b/src/Shared/HandyControl_Shared/Properties/Langs/LangProvider.cs
@@ -37,7 +37,8 @@ namespace HandyControl.Properties.Langs
 
 		private void UpdateLangs()
         {
-			OnPropertyChanged(nameof(Am));
+            OnPropertyChanged(nameof(All));
+            OnPropertyChanged(nameof(Am));
 			OnPropertyChanged(nameof(Cancel));
 			OnPropertyChanged(nameof(CannotRegisterCompositeCommandInItself));
 			OnPropertyChanged(nameof(CannotRegisterSameCommandTwice));
@@ -78,6 +79,11 @@ namespace HandyControl.Properties.Langs
 			OnPropertyChanged(nameof(ZoomOut));
         }
 
+        /// <summary>
+        ///   查找类似 所有 的本地化字符串。
+        /// </summary>
+        public string All => Lang.All;
+
         /// <summary>
         ///   查找类似 上午 的本地化字符串。
         /// </summary>
@@ -282,6 +288,11 @@ namespace HandyControl.Properties.Langs
 
     public class LangKeys
     {
+        /// <summary>
+        ///   查找类似 所有 的本地化字符串。
+        /// </summary>
+        public static string All = nameof(All);
+
         /// <summary>
         ///   查找类似 上午 的本地化字符串。
         /// </summary>
diff --git a/src/Shared/HandyControl_Shared/Themes/Basic/Converters.xaml b/src/Shared/HandyControl_Shared/Themes/Basic/Converters.xaml
index 97245b65..97863a55 100644
--- a/src/Shared/HandyControl_Shared/Themes/Basic/Converters.xaml
+++ b/src/Shared/HandyControl_Shared/Themes/Basic/Converters.xaml
@@ -18,6 +18,7 @@
     <converter:BorderCircularClipConverter x:Key="BorderCircularClipConverter"/>
     <converter:BorderCircularConverter x:Key="BorderCircularConverter"/>
     <converter:Object2VisibilityConverter x:Key="Object2VisibilityConverter"/>
+    <converter:Object2VisibilityReConverter x:Key="Object2VisibilityReConverter"/>
     <converter:Number2PercentageConverter x:Key="Number2PercentageConverter"/>
     <converter:RectangleCircularConverter x:Key="RectangleCircularConverter"/>
     <converter:ThicknessSplitConverter x:Key="ThicknessSplitConverter"/>
diff --git a/src/Shared/HandyControl_Shared/Themes/Styles/Base/CheckComboBoxBaseStyle.xaml b/src/Shared/HandyControl_Shared/Themes/Styles/Base/CheckComboBoxBaseStyle.xaml
index e60f945c..0206170a 100644
--- a/src/Shared/HandyControl_Shared/Themes/Styles/Base/CheckComboBoxBaseStyle.xaml
+++ b/src/Shared/HandyControl_Shared/Themes/Styles/Base/CheckComboBoxBaseStyle.xaml
@@ -1,19 +1,44 @@
 <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                     xmlns:hc="clr-namespace:HandyControl.Controls"
-                    xmlns:themes="clr-namespace:HandyControl.Themes">
+                    xmlns:ex="clr-namespace:HandyControl.Tools.Extension"
+                    xmlns:themes="clr-namespace:HandyControl.Themes"
+                    xmlns:system="clr-namespace:System;assembly=System.Runtime"
+                    xmlns:interactivity="clr-namespace:HandyControl.Interactivity"
+                    xmlns:langs="clr-namespace:HandyControl.Properties.Langs">
 
     <ResourceDictionary.MergedDictionaries>
         <themes:SharedResourceDictionary Source="pack://application:,,,/HandyControl;component/Themes/Styles/Tag.xaml"/>
     </ResourceDictionary.MergedDictionaries>
 
     <Style x:Key="Tag4CheckComboBoxStyle" BasedOn="{StaticResource TagBaseStyle}" TargetType="hc:Tag">
-        <Setter Property="Margin" Value="0,3,4,3"/>
-        <Setter Property="Padding" Value="6,0,4,0"/>
-        <Setter Property="Height" Value="22"/>
+        <Setter Property="Margin" Value="0,3,3,0"/>
+        <Setter Property="Padding" Value="6,3,4,3"/>
+        <Setter Property="Height" Value="Auto"/>
+        <Setter Property="Template">
+            <Setter.Value>
+                <ControlTemplate TargetType="hc:Tag">
+                    <Border CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
+                        <Grid>
+                            <Grid.ColumnDefinitions>
+                                <ColumnDefinition/>
+                                <ColumnDefinition Width="Auto"/>
+                            </Grid.ColumnDefinitions>
+                            <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
+                            <Button Focusable="False" Name="ButtonClose" Visibility="{TemplateBinding ShowCloseButton,Converter={StaticResource Boolean2VisibilityConverter}}" Command="interactivity:ControlCommands.Close" Margin="10,0,0,0" Width="16" Height="16" Padding="0,4" Grid.Column="1" Style="{StaticResource ButtonIcon}" hc:IconElement.Geometry="{StaticResource CloseGeometry}" Foreground="{TemplateBinding Foreground}"/>
+                        </Grid>
+                    </Border>
+                    <ControlTemplate.Triggers>
+                        <Trigger Property="IsMouseOver" Value="True" SourceName="ButtonClose">
+                            <Setter Property="hc:IconElement.Geometry" Value="{StaticResource DeleteFillCircleGeometry}" TargetName="ButtonClose"/>
+                            <Setter Property="Padding" Value="0" TargetName="ButtonClose"/>
+                        </Trigger>
+                    </ControlTemplate.Triggers>
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
     </Style>
 
-    <!--多选组合框切换按钮-->
     <Style x:Key="CheckComboBoxToggleButton" TargetType="ToggleButton">
         <Setter Property="ClickMode" Value="Release"/>
         <Setter Property="OverridesDefaultStyle" Value="true"/>
@@ -40,7 +65,39 @@
         </Setter>
     </Style>
 
-    <!--多选组合框项基样式-->
+    <Style x:Key="CheckComboBoxWatermarkToggleButton" TargetType="ToggleButton">
+        <Setter Property="ClickMode" Value="Release"/>
+        <Setter Property="OverridesDefaultStyle" Value="true"/>
+        <Setter Property="Foreground" Value="{DynamicResource ThirdlyTextBrush}"/>
+        <Setter Property="IsTabStop" Value="false"/>
+        <Setter Property="Focusable" Value="false"/>
+        <Setter Property="Template">
+            <Setter.Value>
+                <ControlTemplate TargetType="ToggleButton">
+                    <Grid>
+                        <Grid.ColumnDefinitions>
+                            <ColumnDefinition/>
+                            <ColumnDefinition Width="30"/>
+                        </Grid.ColumnDefinitions>
+                        <Border Grid.ColumnSpan="2" CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="true"/>
+                        <Path Grid.Column="1" x:Name="arrow" Data="{StaticResource DownGeometry}" Stretch="Uniform" Fill="{TemplateBinding BorderBrush}" HorizontalAlignment="Center" Margin="7" VerticalAlignment="Center"/>
+                        <Border Margin="1" Grid.Column="0" Visibility="{Binding SelectedItem,RelativeSource={RelativeSource AncestorType=hc:CheckComboBox},Converter={StaticResource Object2VisibilityReConverter}}">
+                            <ContentPresenter Focusable="False" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
+                        </Border>
+                    </Grid>
+                    <ControlTemplate.Triggers>
+                        <Trigger Property="IsChecked" Value="True">
+                            <Setter Property="Data" TargetName="arrow" Value="{StaticResource UpGeometry}"/>
+                        </Trigger>
+                        <Trigger Property="IsEnabled" Value="False">
+                            <Setter Property="Opacity" Value=".4"/>
+                        </Trigger>
+                    </ControlTemplate.Triggers>
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
+    </Style>
+
     <Style x:Key="CheckComboBoxItemBaseStyle" TargetType="hc:CheckComboBoxItem">
         <Setter Property="SnapsToDevicePixels" Value="True"/>
         <Setter Property="Padding" Value="{StaticResource DefaultControlPadding}"/>
@@ -49,7 +106,6 @@
         <Setter Property="BorderThickness" Value="0"/>
         <Setter Property="MinHeight" Value="{StaticResource DefaultControlHeight}"/>
         <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
-        <!--<Setter Property="Focusable" Value="False"/>-->
         <Setter Property="Template">
             <Setter.Value>
                 <ControlTemplate TargetType="hc:CheckComboBoxItem">
@@ -68,21 +124,20 @@
         </Setter>
     </Style>
 
-    <!--默认多选组合框模板-->
-    <ControlTemplate x:Key="CheckComboBoxEditableTemplate" TargetType="hc:CheckComboBox">
+    <ControlTemplate x:Key="CheckComboBoxTemplate" TargetType="hc:CheckComboBox">
         <Grid x:Name="templateRoot" SnapsToDevicePixels="true">
             <Grid.ColumnDefinitions>
                 <ColumnDefinition/>
                 <ColumnDefinition Width="30"/>
             </Grid.ColumnDefinitions>
-            <Popup Name="PART_Popup" PlacementTarget="{Binding ElementName=toggleButton}" StaysOpen="False" IsOpen="{Binding IsDropDownOpen,RelativeSource={RelativeSource TemplatedParent},Mode=TwoWay}" AllowsTransparency="true" Grid.ColumnSpan="2" PopupAnimation="{StaticResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom">
+            <Popup x:Name="PART_Popup" PlacementTarget="{Binding ElementName=toggleButton}" StaysOpen="False" IsOpen="{Binding IsDropDownOpen,RelativeSource={RelativeSource TemplatedParent},Mode=TwoWay}" AllowsTransparency="true" Grid.ColumnSpan="2" PopupAnimation="{StaticResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom">
                 <Border CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" x:Name="dropDownBorder" BorderBrush="{DynamicResource BorderBrush}" BorderThickness="1" Background="{DynamicResource RegionBrush}">
                     <Grid Margin="0,4" ClipToBounds="False">
                         <Grid.RowDefinitions>
                             <RowDefinition Height="Auto"/>
                             <RowDefinition/>
                         </Grid.RowDefinitions>
-                        <hc:CheckComboBoxItem x:Name="PART_SelectAll"  Style="{TemplateBinding ItemContainerStyle}" IsEnabled="{TemplateBinding ShowSelectAllButton}" Visibility="{Binding ShowSelectAllButton,RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource Boolean2VisibilityConverter}}" HorizontalContentAlignment="Stretch" Content="全部"/>
+                        <hc:CheckComboBoxItem x:Name="PART_SelectAll"  Style="{TemplateBinding ItemContainerStyle}" IsEnabled="{TemplateBinding ShowSelectAllButton}" Visibility="{Binding ShowSelectAllButton,RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource Boolean2VisibilityConverter}}" HorizontalContentAlignment="Stretch" Content="{ex:Lang Key={x:Static langs:LangKeys.All}}"/>
                         <ScrollViewer x:Name="DropDownScrollViewer" Grid.Row="1">
                             <hc:SimplePanel RenderOptions.ClearTypeHint="Enabled">
                                 <Canvas HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="0">
@@ -96,7 +151,7 @@
             </Popup>
             <ToggleButton Grid.Column="0" x:Name="toggleButton" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen,RelativeSource={RelativeSource TemplatedParent},Mode=TwoWay}" Style="{StaticResource CheckComboBoxToggleButton}"/>
             <Border Grid.Column="0" Margin="-1,1">
-                <WrapPanel Name="PART_Panel" Margin="6,0"/>
+                <WrapPanel Name="PART_Panel" Margin="5,0,5,3"/>
             </Border>
         </Grid>
         <ControlTemplate.Triggers>
@@ -118,8 +173,22 @@
                 <Setter Property="Canvas.Top" TargetName="opaqueRect" Value="{Binding VerticalOffset, ElementName=DropDownScrollViewer}"/>
                 <Setter Property="Canvas.Left" TargetName="opaqueRect" Value="{Binding HorizontalOffset, ElementName=DropDownScrollViewer}"/>
             </Trigger>
+            <MultiTrigger>
+                <MultiTrigger.Conditions>
+                    <Condition Property="IsMouseOver" Value="true" SourceName="toggleButton"/>
+                    <Condition Property="IsOpen" Value="false" SourceName="PART_Popup"/>
+                </MultiTrigger.Conditions>
+                <Setter Property="BorderBrush" Value="{DynamicResource SecondaryBorderBrush}"/>
+            </MultiTrigger>
+            <Trigger Property="IsOpen" Value="True" SourceName="PART_Popup">
+                <Setter Property="BorderBrush" Value="{DynamicResource PrimaryBrush}"/>
+            </Trigger>
+            <Trigger Property="IsFocused" Value="True">
+                <Setter Property="BorderBrush" Value="{DynamicResource PrimaryBrush}"/>
+            </Trigger>
             <Trigger Property="IsEnabled" Value="false">
-                <Setter Property="Opacity" Value="0.4"/>
+                <Setter Property="Opacity" Value="0.4" TargetName="toggleButton"/>
+                <Setter Property="Opacity" Value="0.4" TargetName="PART_Panel"/>
             </Trigger>
         </ControlTemplate.Triggers>
     </ControlTemplate>
@@ -141,8 +210,412 @@
         <Setter Property="ScrollViewer.PanningMode" Value="Both"/>
         <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
         <Setter Property="Padding" Value="{StaticResource DefaultInputPadding}"/>
-        <Setter Property="Template" Value="{StaticResource CheckComboBoxEditableTemplate}"/>
+        <Setter Property="Template" Value="{StaticResource CheckComboBoxTemplate}"/>
         <Setter Property="VerticalContentAlignment" Value="Center"/>
     </Style>
 
+    <ControlTemplate x:Key="CheckComboBoxExtendTopTemplate" TargetType="hc:CheckComboBox">
+        <Grid>
+            <Grid.RowDefinitions>
+                <RowDefinition Height="Auto"/>
+                <RowDefinition MinHeight="{Binding Path=(hc:InfoElement.MinContentHeight),RelativeSource={RelativeSource TemplatedParent}}" Height="{Binding Path=(hc:InfoElement.ContentHeight),RelativeSource={RelativeSource TemplatedParent}}"/>
+            </Grid.RowDefinitions>
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition/>
+                <ColumnDefinition Width="30"/>
+            </Grid.ColumnDefinitions>
+            <StackPanel Grid.ColumnSpan="2" Visibility="{Binding Path=(hc:InfoElement.Title),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource String2VisibilityConverter}}" Orientation="Horizontal" Margin="{TemplateBinding Padding}">
+                <TextBlock Margin="1,0,0,0" Text="{Binding Path=(hc:InfoElement.Title),RelativeSource={RelativeSource TemplatedParent}}"/>
+                <ContentPresenter TextElement.Foreground="{DynamicResource DangerBrush}" Margin="4,0,0,0" Content="{Binding Path=(hc:InfoElement.Symbol),RelativeSource={RelativeSource TemplatedParent}}" Visibility="{Binding Path=(hc:InfoElement.Necessary),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource Boolean2VisibilityConverter}}"/>
+            </StackPanel>
+            <Popup x:Name="PART_Popup" Grid.Row="1" Grid.Column="0" PlacementTarget="{Binding ElementName=toggleButton}" AllowsTransparency="true" Grid.ColumnSpan="2" StaysOpen="False" IsOpen="{Binding IsDropDownOpen,RelativeSource={RelativeSource TemplatedParent},Mode=TwoWay}" Margin="1" PopupAnimation="{StaticResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom">
+                <Border CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" x:Name="dropDownBorder" BorderBrush="{DynamicResource BorderBrush}" BorderThickness="1" Background="{DynamicResource RegionBrush}">
+                    <Grid Margin="0,4" ClipToBounds="False">
+                        <Grid.RowDefinitions>
+                            <RowDefinition Height="Auto"/>
+                            <RowDefinition/>
+                        </Grid.RowDefinitions>
+                        <hc:CheckComboBoxItem x:Name="PART_SelectAll"  Style="{TemplateBinding ItemContainerStyle}" IsEnabled="{TemplateBinding ShowSelectAllButton}" Visibility="{Binding ShowSelectAllButton,RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource Boolean2VisibilityConverter}}" HorizontalContentAlignment="Stretch" Content="{ex:Lang Key={x:Static langs:LangKeys.All}}"/>
+                        <ScrollViewer x:Name="DropDownScrollViewer" Grid.Row="1">
+                            <hc:SimplePanel RenderOptions.ClearTypeHint="Enabled">
+                                <Canvas HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="0">
+                                    <Rectangle x:Name="opaqueRect" Fill="{Binding Background, ElementName=dropDownBorder}" Height="{Binding ActualHeight, ElementName=dropDownBorder}" Width="{Binding ActualWidth, ElementName=dropDownBorder}"/>
+                                </Canvas>
+                                <ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
+                            </hc:SimplePanel>
+                        </ScrollViewer>
+                    </Grid>
+                </Border>
+            </Popup>
+            <ToggleButton Grid.Row="1" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" Content="{Binding Path=(hc:InfoElement.Placeholder),RelativeSource={RelativeSource TemplatedParent}}" Grid.Column="0" x:Name="toggleButton" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource CheckComboBoxWatermarkToggleButton}"/>
+            <Border Grid.Row="1" Grid.Column="0" Margin="1,0">
+                <WrapPanel Name="PART_Panel" Margin="3,1,3,4"/>
+            </Border>
+        </Grid>
+        <ControlTemplate.Triggers>
+            <Trigger Property="HasItems" Value="false">
+                <Setter Property="Height" TargetName="dropDownBorder" Value="95"/>
+            </Trigger>
+            <Trigger Property="hc:DropDownElement.ConsistentWidth" Value="True">
+                <Setter Property="MaxWidth" TargetName="dropDownBorder" Value="{Binding ActualWidth, ElementName=toggleButton}"/>
+                <Setter Property="MinWidth" TargetName="dropDownBorder" Value="{Binding ActualWidth, ElementName=toggleButton}"/>
+            </Trigger>
+            <MultiTrigger>
+                <MultiTrigger.Conditions>
+                    <Condition Property="IsGrouping" Value="true"/>
+                    <Condition Property="VirtualizingPanel.IsVirtualizingWhenGrouping" Value="false"/>
+                </MultiTrigger.Conditions>
+                <Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
+            </MultiTrigger>
+            <Trigger Property="ScrollViewer.CanContentScroll" SourceName="DropDownScrollViewer" Value="false">
+                <Setter Property="Canvas.Top" TargetName="opaqueRect" Value="{Binding VerticalOffset, ElementName=DropDownScrollViewer}"/>
+                <Setter Property="Canvas.Left" TargetName="opaqueRect" Value="{Binding HorizontalOffset, ElementName=DropDownScrollViewer}"/>
+            </Trigger>
+            <MultiTrigger>
+                <MultiTrigger.Conditions>
+                    <Condition Property="IsMouseOver" Value="true" SourceName="toggleButton"/>
+                    <Condition Property="IsOpen" Value="false" SourceName="PART_Popup"/>
+                </MultiTrigger.Conditions>
+                <Setter Property="BorderBrush" Value="{DynamicResource SecondaryBorderBrush}"/>
+            </MultiTrigger>
+            <Trigger Property="IsOpen" Value="True" SourceName="PART_Popup">
+                <Setter Property="BorderBrush" Value="{DynamicResource PrimaryBrush}"/>
+            </Trigger>
+            <Trigger Property="IsFocused" Value="True">
+                <Setter Property="BorderBrush" Value="{DynamicResource PrimaryBrush}"/>
+            </Trigger>
+            <Trigger Property="IsEnabled" Value="false">
+                <Setter Property="Opacity" Value="0.4" TargetName="toggleButton"/>
+                <Setter Property="Opacity" Value="0.4" TargetName="PART_Panel"/>
+            </Trigger>
+        </ControlTemplate.Triggers>
+    </ControlTemplate>
+
+    <ControlTemplate x:Key="CheckComboBoxExtendLeftTemplate" TargetType="hc:CheckComboBox">
+        <Grid x:Name="templateRoot" SnapsToDevicePixels="true" MinHeight="{Binding Path=(hc:InfoElement.MinContentHeight),RelativeSource={RelativeSource TemplatedParent}}" Height="{Binding Path=(hc:InfoElement.ContentHeight),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource Double2GridLengthConverter}}">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="{Binding Path=(hc:InfoElement.TitleWidth),RelativeSource={RelativeSource TemplatedParent}}"/>
+                <ColumnDefinition/>
+                <ColumnDefinition Width="30"/>
+            </Grid.ColumnDefinitions>
+            <StackPanel VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Margin="0,7,6,7" Visibility="{Binding Path=(hc:InfoElement.Title),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource String2VisibilityConverter}}" Orientation="Horizontal">
+                <TextBlock Text="{Binding Path=(hc:InfoElement.Title),RelativeSource={RelativeSource TemplatedParent}}"/>
+                <ContentPresenter TextElement.Foreground="{DynamicResource DangerBrush}" Margin="4,0,0,0" Content="{Binding Path=(hc:InfoElement.Symbol),RelativeSource={RelativeSource TemplatedParent}}" Visibility="{Binding Path=(hc:InfoElement.Necessary),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource Boolean2VisibilityConverter}}"/>
+            </StackPanel>
+            <Popup Grid.Column="1" x:Name="PART_Popup" PlacementTarget="{Binding ElementName=toggleButton}" AllowsTransparency="true" Grid.ColumnSpan="2" StaysOpen="False" IsOpen="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Margin="1" PopupAnimation="{StaticResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom">
+                <Border CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" x:Name="dropDownBorder" BorderBrush="{DynamicResource BorderBrush}" BorderThickness="1" Background="{DynamicResource RegionBrush}">
+                    <Grid Margin="0,4" ClipToBounds="False">
+                        <Grid.RowDefinitions>
+                            <RowDefinition Height="Auto"/>
+                            <RowDefinition/>
+                        </Grid.RowDefinitions>
+                        <hc:CheckComboBoxItem x:Name="PART_SelectAll"  Style="{TemplateBinding ItemContainerStyle}" IsEnabled="{TemplateBinding ShowSelectAllButton}" Visibility="{Binding ShowSelectAllButton,RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource Boolean2VisibilityConverter}}" HorizontalContentAlignment="Stretch" Content="{ex:Lang Key={x:Static langs:LangKeys.All}}"/>
+                        <ScrollViewer x:Name="DropDownScrollViewer" Grid.Row="1">
+                            <hc:SimplePanel RenderOptions.ClearTypeHint="Enabled">
+                                <Canvas HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="0">
+                                    <Rectangle x:Name="opaqueRect" Fill="{Binding Background, ElementName=dropDownBorder}" Height="{Binding ActualHeight, ElementName=dropDownBorder}" Width="{Binding ActualWidth, ElementName=dropDownBorder}"/>
+                                </Canvas>
+                                <ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
+                            </hc:SimplePanel>
+                        </ScrollViewer>
+                    </Grid>
+                </Border>
+            </Popup>
+            <ToggleButton Grid.Column="1" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" Content="{Binding Path=(hc:InfoElement.Placeholder),RelativeSource={RelativeSource TemplatedParent}}" x:Name="toggleButton" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource CheckComboBoxWatermarkToggleButton}"/>
+            <Border Grid.Column="1" Margin="1,0">
+                <WrapPanel Name="PART_Panel" Margin="3,1,3,4"/>
+            </Border>
+        </Grid>
+        <ControlTemplate.Triggers>
+            <Trigger Property="HasItems" Value="false">
+                <Setter Property="Height" TargetName="dropDownBorder" Value="95"/>
+            </Trigger>
+            <Trigger Property="hc:DropDownElement.ConsistentWidth" Value="True">
+                <Setter Property="MaxWidth" TargetName="dropDownBorder" Value="{Binding ActualWidth, ElementName=toggleButton}"/>
+                <Setter Property="MinWidth" TargetName="dropDownBorder" Value="{Binding ActualWidth, ElementName=toggleButton}"/>
+            </Trigger>
+            <MultiTrigger>
+                <MultiTrigger.Conditions>
+                    <Condition Property="IsGrouping" Value="true"/>
+                    <Condition Property="VirtualizingPanel.IsVirtualizingWhenGrouping" Value="false"/>
+                </MultiTrigger.Conditions>
+                <Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
+            </MultiTrigger>
+            <Trigger Property="ScrollViewer.CanContentScroll" SourceName="DropDownScrollViewer" Value="false">
+                <Setter Property="Canvas.Top" TargetName="opaqueRect" Value="{Binding VerticalOffset, ElementName=DropDownScrollViewer}"/>
+                <Setter Property="Canvas.Left" TargetName="opaqueRect" Value="{Binding HorizontalOffset, ElementName=DropDownScrollViewer}"/>
+            </Trigger>
+            <MultiTrigger>
+                <MultiTrigger.Conditions>
+                    <Condition Property="IsMouseOver" Value="true" SourceName="toggleButton"/>
+                    <Condition Property="IsOpen" Value="false" SourceName="PART_Popup"/>
+                </MultiTrigger.Conditions>
+                <Setter Property="BorderBrush" Value="{DynamicResource SecondaryBorderBrush}"/>
+            </MultiTrigger>
+            <Trigger Property="IsOpen" Value="True" SourceName="PART_Popup">
+                <Setter Property="BorderBrush" Value="{DynamicResource PrimaryBrush}"/>
+            </Trigger>
+            <Trigger Property="IsFocused" Value="True">
+                <Setter Property="BorderBrush" Value="{DynamicResource PrimaryBrush}"/>
+            </Trigger>
+            <Trigger Property="IsEnabled" Value="false">
+                <Setter Property="Opacity" Value="0.4" TargetName="toggleButton"/>
+                <Setter Property="Opacity" Value="0.4" TargetName="PART_Panel"/>
+            </Trigger>
+        </ControlTemplate.Triggers>
+    </ControlTemplate>
+
+    <Style x:Key="CheckComboBoxExtendBaseStyle" BasedOn="{StaticResource CheckComboBoxBaseStyle}" TargetType="hc:CheckComboBox">
+        <Setter Property="Height" Value="Auto"/>
+        <Setter Property="Template" Value="{StaticResource CheckComboBoxExtendTopTemplate}"/>
+        <Setter Property="hc:InfoElement.Symbol" Value="●"/>
+        <Setter Property="hc:InfoElement.ContentHeight" Value="{x:Static system:Double.NaN}"/>
+        <Setter Property="hc:InfoElement.MinContentHeight" Value="{StaticResource DefaultControlHeight}"/>
+        <Style.Triggers>
+            <Trigger Property="hc:InfoElement.TitlePlacement" Value="Left">
+                <Setter Property="Template" Value="{StaticResource CheckComboBoxExtendLeftTemplate}"/>
+            </Trigger>
+        </Style.Triggers>
+    </Style>
+
+    <ControlTemplate x:Key="CheckComboBoxPlusTopTemplate" TargetType="hc:CheckComboBox">
+        <ControlTemplate.Resources>
+            <Storyboard x:Key="StoryboardShow">
+                <ThicknessAnimation Storyboard.TargetName="TextBlockError" Storyboard.TargetProperty="Margin" To="9,0,0,-18" Duration="0:0:.2"/>
+            </Storyboard>
+            <Storyboard x:Key="StoryboardHidden">
+                <ThicknessAnimation Storyboard.TargetName="TextBlockError" Storyboard.TargetProperty="Margin" To="9,0,0,4" Duration="0:0:0"/>
+            </Storyboard>
+        </ControlTemplate.Resources>
+        <Grid >
+            <Grid.RowDefinitions>
+                <RowDefinition Height="Auto"/>
+                <RowDefinition MinHeight="{Binding Path=(hc:InfoElement.MinContentHeight),RelativeSource={RelativeSource TemplatedParent}}" Height="{Binding Path=(hc:InfoElement.ContentHeight),RelativeSource={RelativeSource TemplatedParent}}"/>
+            </Grid.RowDefinitions>
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition/>
+                <ColumnDefinition Width="Auto" MinWidth="30"/>
+            </Grid.ColumnDefinitions>
+            <StackPanel Grid.ColumnSpan="2" Visibility="{Binding Path=(hc:InfoElement.Title),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource String2VisibilityConverter}}" Orientation="Horizontal" Margin="{TemplateBinding Padding}">
+                <TextBlock Margin="1,0,0,0" Text="{Binding Path=(hc:InfoElement.Title),RelativeSource={RelativeSource TemplatedParent}}"/>
+                <ContentPresenter TextElement.Foreground="{DynamicResource DangerBrush}" Margin="4,0,0,0" Content="{Binding Path=(hc:InfoElement.Symbol),RelativeSource={RelativeSource TemplatedParent}}" Visibility="{Binding Path=(hc:InfoElement.Necessary),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource Boolean2VisibilityConverter}}"/>
+            </StackPanel>
+            <Popup Grid.Row="1" Grid.Column="0" x:Name="PART_Popup" PlacementTarget="{Binding ElementName=toggleButton}" AllowsTransparency="true" Grid.ColumnSpan="2" StaysOpen="False" IsOpen="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Margin="1" PopupAnimation="{StaticResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom">
+                <Border CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" x:Name="dropDownBorder" BorderBrush="{DynamicResource BorderBrush}" BorderThickness="1" Background="{DynamicResource RegionBrush}">
+                    <Grid Margin="0,4" ClipToBounds="False">
+                        <Grid.RowDefinitions>
+                            <RowDefinition Height="Auto"/>
+                            <RowDefinition/>
+                        </Grid.RowDefinitions>
+                        <hc:CheckComboBoxItem x:Name="PART_SelectAll"  Style="{TemplateBinding ItemContainerStyle}" IsEnabled="{TemplateBinding ShowSelectAllButton}" Visibility="{Binding ShowSelectAllButton,RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource Boolean2VisibilityConverter}}" HorizontalContentAlignment="Stretch" Content="{ex:Lang Key={x:Static langs:LangKeys.All}}"/>
+                        <ScrollViewer x:Name="DropDownScrollViewer" Grid.Row="1">
+                            <hc:SimplePanel RenderOptions.ClearTypeHint="Enabled">
+                                <Canvas HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="0">
+                                    <Rectangle x:Name="opaqueRect" Fill="{Binding Background, ElementName=dropDownBorder}" Height="{Binding ActualHeight, ElementName=dropDownBorder}" Width="{Binding ActualWidth, ElementName=dropDownBorder}"/>
+                                </Canvas>
+                                <ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
+                            </hc:SimplePanel>
+                        </ScrollViewer>
+                    </Grid>
+                </Border>
+            </Popup>
+            <TextBlock Grid.Column="0" Grid.ColumnSpan="2" FontSize="12" Text="{TemplateBinding ErrorStr}" Name="TextBlockError" VerticalAlignment="Bottom" Margin="9,0,0,4" Foreground="{DynamicResource DangerBrush}" Grid.Row="1"/>
+            <ToggleButton Grid.Row="1" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" Content="{Binding Path=(hc:InfoElement.Placeholder),RelativeSource={RelativeSource TemplatedParent}}" Grid.Column="0" x:Name="toggleButton" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource CheckComboBoxWatermarkToggleButton}"/>
+            <Border Grid.Row="1" Grid.Column="0" Margin="1,0">
+                <WrapPanel Name="PART_Panel" Margin="3,1,3,4"/>
+            </Border>
+            <Button Grid.Row="1" Command="interactivity:ControlCommands.Clear" Margin="0,0,26,0" Visibility="Collapsed" Name="ButtonClear" Width="16" Grid.Column="1" Style="{StaticResource ButtonIcon}" Padding="0,6" hc:IconElement.Geometry="{StaticResource DeleteFillCircleGeometry}" Foreground="{TemplateBinding BorderBrush}"/>
+        </Grid>
+        <ControlTemplate.Triggers>
+            <Trigger Property="HasItems" Value="false">
+                <Setter Property="Height" TargetName="dropDownBorder" Value="95"/>
+            </Trigger>
+            <Trigger Property="hc:DropDownElement.ConsistentWidth" Value="True">
+                <Setter Property="MaxWidth" TargetName="dropDownBorder" Value="{Binding ActualWidth, ElementName=toggleButton}"/>
+                <Setter Property="MinWidth" TargetName="dropDownBorder" Value="{Binding ActualWidth, ElementName=toggleButton}"/>
+            </Trigger>
+            <MultiTrigger>
+                <MultiTrigger.Conditions>
+                    <Condition Property="IsGrouping" Value="true"/>
+                    <Condition Property="VirtualizingPanel.IsVirtualizingWhenGrouping" Value="false"/>
+                </MultiTrigger.Conditions>
+                <Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
+            </MultiTrigger>
+            <Trigger Property="ScrollViewer.CanContentScroll" SourceName="DropDownScrollViewer" Value="false">
+                <Setter Property="Canvas.Top" TargetName="opaqueRect" Value="{Binding VerticalOffset, ElementName=DropDownScrollViewer}"/>
+                <Setter Property="Canvas.Left" TargetName="opaqueRect" Value="{Binding HorizontalOffset, ElementName=DropDownScrollViewer}"/>
+            </Trigger>
+            <MultiTrigger>
+                <MultiTrigger.Conditions>
+                    <Condition Property="IsMouseOver" Value="true" SourceName="toggleButton"/>
+                    <Condition Property="IsOpen" Value="false" SourceName="PART_Popup"/>
+                </MultiTrigger.Conditions>
+                <Setter Property="BorderBrush" Value="{DynamicResource SecondaryBorderBrush}"/>
+            </MultiTrigger>
+            <MultiTrigger>
+                <MultiTrigger.Conditions>
+                    <Condition Property="IsMouseOver" Value="true" SourceName="ButtonClear"/>
+                    <Condition Property="IsOpen" Value="false" SourceName="PART_Popup"/>
+                </MultiTrigger.Conditions>
+                <Setter Property="BorderBrush" Value="{DynamicResource SecondaryBorderBrush}"/>
+            </MultiTrigger>
+            <MultiTrigger>
+                <MultiTrigger.Conditions>
+                    <Condition Property="IsMouseOver" Value="true" SourceName="toggleButton"/>
+                    <Condition Property="ShowClearButton" Value="True"/>
+                </MultiTrigger.Conditions>
+                <Setter Property="Visibility" Value="Visible" TargetName="ButtonClear"/>
+            </MultiTrigger>
+            <MultiTrigger>
+                <MultiTrigger.Conditions>
+                    <Condition Property="IsMouseOver" Value="true" SourceName="ButtonClear"/>
+                    <Condition Property="ShowClearButton" Value="True"/>
+                </MultiTrigger.Conditions>
+                <Setter Property="Visibility" Value="Visible" TargetName="ButtonClear"/>
+            </MultiTrigger>
+            <Trigger Property="IsOpen" Value="True" SourceName="PART_Popup">
+                <Setter Property="BorderBrush" Value="{DynamicResource PrimaryBrush}"/>
+            </Trigger>
+            <Trigger Property="IsFocused" Value="True">
+                <Setter Property="BorderBrush" Value="{DynamicResource PrimaryBrush}"/>
+            </Trigger>
+            <Trigger Property="IsError" Value="true">
+                <Setter Property="BorderBrush" Value="{DynamicResource DangerBrush}"/>
+                <Trigger.EnterActions>
+                    <BeginStoryboard Storyboard="{StaticResource StoryboardShow}"/>
+                </Trigger.EnterActions>
+                <Trigger.ExitActions>
+                    <BeginStoryboard Storyboard="{StaticResource StoryboardHidden}"/>
+                </Trigger.ExitActions>
+            </Trigger>
+            <Trigger Property="IsEnabled" Value="false">
+                <Setter Property="Opacity" Value="0.4" TargetName="toggleButton"/>
+                <Setter Property="Opacity" Value="0.4" TargetName="PART_Panel"/>
+            </Trigger>
+        </ControlTemplate.Triggers>
+    </ControlTemplate>
+
+    <ControlTemplate x:Key="CheckComboBoxPlusLeftTemplate" TargetType="hc:CheckComboBox">
+        <ControlTemplate.Resources>
+            <Storyboard x:Key="StoryboardShow">
+                <ThicknessAnimation Storyboard.TargetName="TextBlockError" Storyboard.TargetProperty="Margin" To="9,0,0,-18" Duration="0:0:.2"/>
+            </Storyboard>
+            <Storyboard x:Key="StoryboardHidden">
+                <ThicknessAnimation Storyboard.TargetName="TextBlockError" Storyboard.TargetProperty="Margin" To="9,0,0,4" Duration="0:0:0"/>
+            </Storyboard>
+        </ControlTemplate.Resources>
+        <Grid x:Name="templateRoot" SnapsToDevicePixels="true" MinHeight="{Binding Path=(hc:InfoElement.MinContentHeight),RelativeSource={RelativeSource TemplatedParent}}" Height="{Binding Path=(hc:InfoElement.ContentHeight),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource Double2GridLengthConverter}}">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="{Binding Path=(hc:InfoElement.TitleWidth),RelativeSource={RelativeSource TemplatedParent}}"/>
+                <ColumnDefinition/>
+                <ColumnDefinition Width="Auto" MinWidth="30"/>
+            </Grid.ColumnDefinitions>
+            <StackPanel VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Margin="0,7,6,7" Visibility="{Binding Path=(hc:InfoElement.Title),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource String2VisibilityConverter}}" Orientation="Horizontal">
+                <TextBlock Text="{Binding Path=(hc:InfoElement.Title),RelativeSource={RelativeSource TemplatedParent}}"/>
+                <ContentPresenter TextElement.Foreground="{DynamicResource DangerBrush}" Margin="4,0,0,0" Content="{Binding Path=(hc:InfoElement.Symbol),RelativeSource={RelativeSource TemplatedParent}}" Visibility="{Binding Path=(hc:InfoElement.Necessary),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource Boolean2VisibilityConverter}}"/>
+            </StackPanel>
+            <Popup Grid.Column="1" x:Name="PART_Popup" PlacementTarget="{Binding ElementName=toggleButton}" AllowsTransparency="true" Grid.ColumnSpan="2" StaysOpen="False" IsOpen="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Margin="1" PopupAnimation="{StaticResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom">
+                <Border CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" x:Name="dropDownBorder" BorderBrush="{DynamicResource BorderBrush}" BorderThickness="1" Background="{DynamicResource RegionBrush}">
+                    <Grid Margin="0,4" ClipToBounds="False">
+                        <Grid.RowDefinitions>
+                            <RowDefinition Height="Auto"/>
+                            <RowDefinition/>
+                        </Grid.RowDefinitions>
+                        <hc:CheckComboBoxItem x:Name="PART_SelectAll"  Style="{TemplateBinding ItemContainerStyle}" IsEnabled="{TemplateBinding ShowSelectAllButton}" Visibility="{Binding ShowSelectAllButton,RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource Boolean2VisibilityConverter}}" HorizontalContentAlignment="Stretch" Content="{ex:Lang Key={x:Static langs:LangKeys.All}}"/>
+                        <ScrollViewer x:Name="DropDownScrollViewer" Grid.Row="1">
+                            <hc:SimplePanel RenderOptions.ClearTypeHint="Enabled">
+                                <Canvas HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="0">
+                                    <Rectangle x:Name="opaqueRect" Fill="{Binding Background, ElementName=dropDownBorder}" Height="{Binding ActualHeight, ElementName=dropDownBorder}" Width="{Binding ActualWidth, ElementName=dropDownBorder}"/>
+                                </Canvas>
+                                <ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
+                            </hc:SimplePanel>
+                        </ScrollViewer>
+                    </Grid>
+                </Border>
+            </Popup>
+            <TextBlock Grid.Column="1" Grid.ColumnSpan="2" FontSize="12" Text="{TemplateBinding ErrorStr}" Name="TextBlockError" VerticalAlignment="Bottom" Margin="9,0,0,4" Foreground="{DynamicResource DangerBrush}"/>
+            <ToggleButton Grid.Column="1" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" Content="{Binding Path=(hc:InfoElement.Placeholder),RelativeSource={RelativeSource TemplatedParent}}" x:Name="toggleButton" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource CheckComboBoxWatermarkToggleButton}"/>
+            <Border Grid.Column="1" Margin="1,0">
+                <WrapPanel Name="PART_Panel" Margin="3,1,3,4"/>
+            </Border>
+            <Button Command="interactivity:ControlCommands.Clear" Margin="0,0,26,0" Visibility="Collapsed" Name="ButtonClear" Width="16" Grid.Column="2" Style="{StaticResource ButtonIcon}" Padding="0,6" hc:IconElement.Geometry="{StaticResource DeleteFillCircleGeometry}" Foreground="{TemplateBinding BorderBrush}"/>
+        </Grid>
+        <ControlTemplate.Triggers>
+            <Trigger Property="HasItems" Value="false">
+                <Setter Property="Height" TargetName="dropDownBorder" Value="95"/>
+            </Trigger>
+            <Trigger Property="hc:DropDownElement.ConsistentWidth" Value="True">
+                <Setter Property="MaxWidth" TargetName="dropDownBorder" Value="{Binding ActualWidth, ElementName=toggleButton}"/>
+                <Setter Property="MinWidth" TargetName="dropDownBorder" Value="{Binding ActualWidth, ElementName=toggleButton}"/>
+            </Trigger>
+            <MultiTrigger>
+                <MultiTrigger.Conditions>
+                    <Condition Property="IsGrouping" Value="true"/>
+                    <Condition Property="VirtualizingPanel.IsVirtualizingWhenGrouping" Value="false"/>
+                </MultiTrigger.Conditions>
+                <Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
+            </MultiTrigger>
+            <Trigger Property="ScrollViewer.CanContentScroll" SourceName="DropDownScrollViewer" Value="false">
+                <Setter Property="Canvas.Top" TargetName="opaqueRect" Value="{Binding VerticalOffset, ElementName=DropDownScrollViewer}"/>
+                <Setter Property="Canvas.Left" TargetName="opaqueRect" Value="{Binding HorizontalOffset, ElementName=DropDownScrollViewer}"/>
+            </Trigger>
+            <MultiTrigger>
+                <MultiTrigger.Conditions>
+                    <Condition Property="IsMouseOver" Value="true" SourceName="toggleButton"/>
+                    <Condition Property="IsOpen" Value="false" SourceName="PART_Popup"/>
+                </MultiTrigger.Conditions>
+                <Setter Property="BorderBrush" Value="{DynamicResource SecondaryBorderBrush}"/>
+            </MultiTrigger>
+            <MultiTrigger>
+                <MultiTrigger.Conditions>
+                    <Condition Property="IsMouseOver" Value="true" SourceName="ButtonClear"/>
+                    <Condition Property="IsOpen" Value="false" SourceName="PART_Popup"/>
+                </MultiTrigger.Conditions>
+                <Setter Property="BorderBrush" Value="{DynamicResource SecondaryBorderBrush}"/>
+            </MultiTrigger>
+            <MultiTrigger>
+                <MultiTrigger.Conditions>
+                    <Condition Property="IsMouseOver" Value="true" SourceName="toggleButton"/>
+                    <Condition Property="ShowClearButton" Value="True"/>
+                </MultiTrigger.Conditions>
+                <Setter Property="Visibility" Value="Visible" TargetName="ButtonClear"/>
+            </MultiTrigger>
+            <MultiTrigger>
+                <MultiTrigger.Conditions>
+                    <Condition Property="IsMouseOver" Value="true" SourceName="ButtonClear"/>
+                    <Condition Property="ShowClearButton" Value="True"/>
+                </MultiTrigger.Conditions>
+                <Setter Property="Visibility" Value="Visible" TargetName="ButtonClear"/>
+            </MultiTrigger>
+            <Trigger Property="IsOpen" Value="True" SourceName="PART_Popup">
+                <Setter Property="BorderBrush" Value="{DynamicResource PrimaryBrush}"/>
+            </Trigger>
+            <Trigger Property="IsFocused" Value="True">
+                <Setter Property="BorderBrush" Value="{DynamicResource PrimaryBrush}"/>
+            </Trigger>
+            <Trigger Property="IsError" Value="true">
+                <Setter Property="BorderBrush" Value="{DynamicResource DangerBrush}"/>
+                <Trigger.EnterActions>
+                    <BeginStoryboard Storyboard="{StaticResource StoryboardShow}"/>
+                </Trigger.EnterActions>
+                <Trigger.ExitActions>
+                    <BeginStoryboard Storyboard="{StaticResource StoryboardHidden}"/>
+                </Trigger.ExitActions>
+            </Trigger>
+            <Trigger Property="IsEnabled" Value="false">
+                <Setter Property="Opacity" Value="0.4" TargetName="toggleButton"/>
+                <Setter Property="Opacity" Value="0.4" TargetName="PART_Panel"/>
+            </Trigger>
+        </ControlTemplate.Triggers>
+    </ControlTemplate>
+
+    <Style x:Key="CheckComboBoxPlusBaseStyle" BasedOn="{StaticResource CheckComboBoxExtendBaseStyle}" TargetType="hc:CheckComboBox">
+        <Setter Property="Template" Value="{StaticResource CheckComboBoxPlusTopTemplate}"/>
+        <Style.Triggers>
+            <Trigger Property="hc:InfoElement.TitlePlacement" Value="Left">
+                <Setter Property="Template" Value="{StaticResource CheckComboBoxPlusLeftTemplate}"/>
+            </Trigger>
+        </Style.Triggers>
+    </Style>
+
 </ResourceDictionary>
diff --git a/src/Shared/HandyControl_Shared/Themes/Styles/CheckComboBox.xaml b/src/Shared/HandyControl_Shared/Themes/Styles/CheckComboBox.xaml
index 8656e2fc..0278e91e 100644
--- a/src/Shared/HandyControl_Shared/Themes/Styles/CheckComboBox.xaml
+++ b/src/Shared/HandyControl_Shared/Themes/Styles/CheckComboBox.xaml
@@ -1,4 +1,5 @@
 <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                     xmlns:hc="clr-namespace:HandyControl.Controls"
                     xmlns:themes="clr-namespace:HandyControl.Themes">
 
@@ -8,4 +9,8 @@
 
     <Style BasedOn="{StaticResource CheckComboBoxBaseStyle}" TargetType="hc:CheckComboBox"/>
 
+    <Style x:Key="CheckComboBoxExtend" BasedOn="{StaticResource CheckComboBoxExtendBaseStyle}" TargetType="hc:CheckComboBox"/>
+
+    <Style x:Key="CheckComboBoxPlus" BasedOn="{StaticResource CheckComboBoxPlusBaseStyle}" TargetType="hc:CheckComboBox"/>
+
 </ResourceDictionary>
\ No newline at end of file
diff --git a/src/Shared/HandyControl_Shared/Tools/Converter/Object2VisibilityReConverter.cs b/src/Shared/HandyControl_Shared/Tools/Converter/Object2VisibilityReConverter.cs
new file mode 100644
index 00000000..e5b3e39a
--- /dev/null
+++ b/src/Shared/HandyControl_Shared/Tools/Converter/Object2VisibilityReConverter.cs
@@ -0,0 +1,20 @@
+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace HandyControl.Tools.Converter
+{
+    public class Object2VisibilityReConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return value == null ? Visibility.Visible : Visibility.Collapsed;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}