diff --git a/src/ext_widgets/guage/guage.c b/src/ext_widgets/guage/guage.c
index 0e6f84983..3ea03a4b9 100644
--- a/src/ext_widgets/guage/guage.c
+++ b/src/ext_widgets/guage/guage.c
@@ -102,18 +102,19 @@ static ret_t guage_on_paint_self(widget_t* widget, canvas_t* c) {
   return RET_OK;
 }
 
-static const widget_vtable_t s_guage_vtable = {.size = sizeof(guage_t),
-                                               .type = WIDGET_TYPE_GUAGE,
-                                               .clone_properties = s_guage_properties,
-                                               .persistent_properties = s_guage_properties,
-                                               .create = guage_create,
-                                               .on_paint_self = guage_on_paint_self,
-                                               .set_prop = guage_set_prop,
-                                               .get_prop = guage_get_prop,
-                                               .on_destroy = guage_on_destroy};
+TK_DECL_VTABLE(guage) = {.size = sizeof(guage_t),
+                         .type = WIDGET_TYPE_GUAGE,
+                         .clone_properties = s_guage_properties,
+                         .persistent_properties = s_guage_properties,
+                         .parent = TK_PARENT_VTABLE(widget),
+                         .create = guage_create,
+                         .on_paint_self = guage_on_paint_self,
+                         .set_prop = guage_set_prop,
+                         .get_prop = guage_get_prop,
+                         .on_destroy = guage_on_destroy};
 
 widget_t* guage_create(widget_t* parent, xy_t x, xy_t y, wh_t w, wh_t h) {
-  widget_t* widget = widget_create(parent, &s_guage_vtable, x, y, w, h);
+  widget_t* widget = widget_create(parent, TK_REF_VTABLE(guage), x, y, w, h);
   guage_t* guage = GUAGE(widget);
 
   return_value_if_fail(guage != NULL, NULL);
@@ -124,7 +125,7 @@ widget_t* guage_create(widget_t* parent, xy_t x, xy_t y, wh_t w, wh_t h) {
 }
 
 widget_t* guage_cast(widget_t* widget) {
-  return_value_if_fail(widget != NULL && widget->vt == &s_guage_vtable, NULL);
+  return_value_if_fail(WIDGET_IS_INSTANCE_OF(widget, guage), NULL);
 
   return widget;
 }
diff --git a/src/ext_widgets/guage/guage.h b/src/ext_widgets/guage/guage.h
index 56d48abf4..7c59a10d1 100644
--- a/src/ext_widgets/guage/guage.h
+++ b/src/ext_widgets/guage/guage.h
@@ -135,7 +135,10 @@ ret_t guage_set_image(widget_t* widget, const char* name);
 ret_t guage_set_draw_type(widget_t* widget, image_draw_type_t draw_type);
 
 #define WIDGET_TYPE_GUAGE "guage"
-#define GUAGE(widget) ((guage_t*)(widget))
+#define GUAGE(widget) ((guage_t*)(guage_cast(WIDGET(widget))))
+
+/*public for subclass and runtime type check*/
+TK_EXTERN_VTABLE(guage);
 
 END_C_DECLS
 
diff --git a/src/ext_widgets/guage/guage_pointer.c b/src/ext_widgets/guage/guage_pointer.c
old mode 100755
new mode 100644
index 15c914469..2d2bd1ff9
--- a/src/ext_widgets/guage/guage_pointer.c
+++ b/src/ext_widgets/guage/guage_pointer.c
@@ -174,24 +174,24 @@ static ret_t guage_pointer_on_paint_self(widget_t* widget, canvas_t* c) {
 static const char* s_guage_pointer_properties[] = {GUAGE_POINTER_PROP_ANGLE, WIDGET_PROP_IMAGE,
                                                    NULL};
 
-static const widget_vtable_t s_guage_pointer_vtable = {
-    .size = sizeof(guage_pointer_t),
-    .type = WIDGET_TYPE_GUAGE_POINTER,
-    .clone_properties = s_guage_pointer_properties,
-    .persistent_properties = s_guage_pointer_properties,
-    .create = guage_pointer_create,
-    .on_paint_self = guage_pointer_on_paint_self,
-    .on_paint_background = widget_on_paint_null,
-    .set_prop = guage_pointer_set_prop,
-    .get_prop = guage_pointer_get_prop,
-    .on_destroy = guage_pointer_on_destroy};
+TK_DECL_VTABLE(guage_pointer) = {.size = sizeof(guage_pointer_t),
+                                 .type = WIDGET_TYPE_GUAGE_POINTER,
+                                 .clone_properties = s_guage_pointer_properties,
+                                 .persistent_properties = s_guage_pointer_properties,
+                                 .parent = TK_PARENT_VTABLE(widget),
+                                 .create = guage_pointer_create,
+                                 .on_paint_self = guage_pointer_on_paint_self,
+                                 .on_paint_background = widget_on_paint_null,
+                                 .set_prop = guage_pointer_set_prop,
+                                 .get_prop = guage_pointer_get_prop,
+                                 .on_destroy = guage_pointer_on_destroy};
 
 widget_t* guage_pointer_create(widget_t* parent, xy_t x, xy_t y, wh_t w, wh_t h) {
-  return widget_create(parent, &s_guage_pointer_vtable, x, y, w, h);
+  return widget_create(parent, TK_REF_VTABLE(guage_pointer), x, y, w, h);
 }
 
 widget_t* guage_pointer_cast(widget_t* widget) {
-  return_value_if_fail(widget != NULL && widget->vt == &s_guage_pointer_vtable, NULL);
+  return_value_if_fail(WIDGET_IS_INSTANCE_OF(widget, guage_pointer), NULL);
 
   return widget;
 }
diff --git a/src/ext_widgets/guage/guage_pointer.h b/src/ext_widgets/guage/guage_pointer.h
index fb425dde5..8fd96a689 100644
--- a/src/ext_widgets/guage/guage_pointer.h
+++ b/src/ext_widgets/guage/guage_pointer.h
@@ -130,7 +130,10 @@ ret_t guage_pointer_set_image(widget_t* widget, const char* image);
 
 #define GUAGE_POINTER_PROP_ANGLE "angle"
 #define WIDGET_TYPE_GUAGE_POINTER "guage_pointer"
-#define GUAGE_POINTER(widget) ((guage_pointer_t*)(widget))
+#define GUAGE_POINTER(widget) ((guage_pointer_t*)(guage_pointer_cast(WIDGET(widget))))
+
+/*public for subclass and runtime type check*/
+TK_EXTERN_VTABLE(guage_pointer);
 
 END_C_DECLS
 
diff --git a/tests/guage_pointer_test.cc b/tests/guage_pointer_test.cc
new file mode 100644
index 000000000..d43c192e3
--- /dev/null
+++ b/tests/guage_pointer_test.cc
@@ -0,0 +1,10 @@
+#include "guage/guage_pointer.h"
+#include "gtest/gtest.h"
+
+TEST(GuagePointer, cast) {
+  widget_t* w = guage_pointer_create(NULL, 0, 0, 100, 100);
+
+  ASSERT_EQ(w, guage_pointer_cast(w));
+
+  widget_destroy(w);
+}
diff --git a/tests/guage_test.cc b/tests/guage_test.cc
new file mode 100644
index 000000000..72e8e22ec
--- /dev/null
+++ b/tests/guage_test.cc
@@ -0,0 +1,12 @@
+#include "widgets/window.h"
+#include "guage/guage.h"
+#include "gtest/gtest.h"
+
+TEST(Guage, cast) {
+  widget_t* w = window_create(NULL, 0, 0, 0, 0);
+  widget_t* guage = guage_create(w, 0, 0, 100, 100);
+
+  ASSERT_EQ(guage, guage_cast(guage));
+
+  widget_destroy(w);
+}