awtk/design/default/ui/tab_control.xml

<window children_layout="default(c=2,h=30,m=5,s=5)">
    <button name="open:tab_top" text="Top"/>
    <button name="open:tab_bottom" text="Bottom"/>
    <button name="open:tab_top_compact" text="Top Compact"/>
    <button name="open:tab_bottom_compact" text="Bottom Compact"/>
    <button name="open:tab_list" text="List"/>
    <button name="open:tab_scrollable" text="Scrollable"/>
    <button name="open:tab_scrollable_and_dragchild" text="Drag_Child"/>
    <button name="open:tab_dynamic_list" text="tab_dynamic_list"/>
    <button name="open:tab_remove" text="tab_remove"/>
    <button name="open:tab_invisible" text="Invisible"/>
    <button name="open:tab_invisible_compact" text="Invisible Compact"/>
    <button name="close" text="Close"/>
</window>