diff --git a/Import/GacUI.cpp b/Import/GacUI.cpp
index 8eacbb41..d3326e03 100644
--- a/Import/GacUI.cpp
+++ b/Import/GacUI.cpp
@@ -31163,13 +31163,14 @@ GuiMenuButton
 				return subMenu;
 			}
 
-			void GuiMenuButton::CreateSubMenu(GuiMenu::IStyleController* subMenuStyleController)
+			GuiMenu* GuiMenuButton::CreateSubMenu(GuiMenu::IStyleController* subMenuStyleController)
 			{
 				if(!subMenu)
 				{
 					GuiMenu* newSubMenu=new GuiMenu(subMenuStyleController?subMenuStyleController:styleController->CreateSubMenuStyleController(), this);
 					SetSubMenu(newSubMenu, true);
 				}
+				return subMenu;
 			}
 
 			void GuiMenuButton::SetSubMenu(GuiMenu* value, bool owned)
diff --git a/Import/GacUI.h b/Import/GacUI.h
index b1e378f8..f7885feb 100644
--- a/Import/GacUI.h
+++ b/Import/GacUI.h
@@ -11330,8 +11330,9 @@ MenuButton
 				/// <returns>The sub menu.</returns>
 				GuiMenu*								GetSubMenu();
 				/// <summary>Create the sub menu if necessary. The created sub menu is owned by this menu button.</summary>
+				/// <returns>The created sub menu.</returns>
 				/// <param name="subMenuStyleController">The style controller for the sub menu. If this argument is null, it will call <see cref="IStyleController::CreateSubMenuStyleController"/> for a style controller.</param>
-				void									CreateSubMenu(GuiMenu::IStyleController* subMenuStyleController=0);
+				GuiMenu*								CreateSubMenu(GuiMenu::IStyleController* subMenuStyleController=0);
 				/// <summary>Associate a sub menu if there is no sub menu binded in this menu button. The associated sub menu is not owned by this menu button if the "owned" argument is set to false.</summary>
 				/// <param name="value">The sub menu to associate.</param>
 				/// <param name="owned">Set to true if the menu is expected to be owned.</param>
diff --git a/Import/GacUIReflection.cpp b/Import/GacUIReflection.cpp
index d5f3500c..8c5d44b7 100644
--- a/Import/GacUIReflection.cpp
+++ b/Import/GacUIReflection.cpp
@@ -704,18 +704,14 @@ GuiInstanceLoaderManager
 			struct VirtualTypeInfo
 			{
 				GlobalStringKey						typeName;
-				ITypeDescriptor*					typeDescriptor;
+				ITypeDescriptor*					typeDescriptor = nullptr;
 				GlobalStringKey						parentTypeName;				// for virtual type only
 				Ptr<IGuiInstanceLoader>				loader;
 
 				List<ITypeDescriptor*>				parentTypes;				// all direct or indirect base types that does not has a type info
 				List<VirtualTypeInfo*>				parentTypeInfos;			// type infos for all registered direct or indirect base types
-
-				VirtualTypeInfo()
-					:typeDescriptor(0)
-				{
-				}
 			};
+
 			typedef Dictionary<GlobalStringKey, Ptr<VirtualTypeInfo>>		VirtualTypeInfoMap;
 			typedef Dictionary<WString, Ptr<GuiResource>>					ResourceMap;
 			typedef Pair<Ptr<GuiResource>, Ptr<GuiResourceItem>>			ResourceItemPair;
@@ -759,6 +755,10 @@ GuiInstanceLoaderManager
 
 			void FillParentTypeInfos(Ptr<VirtualTypeInfo> typeInfo)
 			{
+				if (typeInfo->parentTypeName != GlobalStringKey::Empty)
+				{
+					typeInfo->typeDescriptor = nullptr;
+				}
 				typeInfo->parentTypes.Clear();
 				typeInfo->parentTypeInfos.Clear();
 
@@ -5241,22 +5241,19 @@ GuiToolstripButtonInstanceLoader
 
 				Ptr<workflow::WfExpression> GetParameter(const PropertyInfo& propertyInfo, GlobalStringKey variableName, collections::List<WString>& errors)
 				{
-					if (propertyInfo.typeInfo.typeName == GetTypeName())
+					if (propertyInfo.propertyName == _SubMenu)
 					{
-						if (propertyInfo.propertyName == _SubMenu)
-						{
-							auto refControl = MakePtr<WfReferenceExpression>();
-							refControl->name.value = variableName.ToString();
+						auto refControl = MakePtr<WfReferenceExpression>();
+						refControl->name.value = variableName.ToString();
 
-							auto refEnsureToolstripSubMenu = MakePtr<WfMemberExpression>();
-							refEnsureToolstripSubMenu->parent = refControl;
-							refEnsureToolstripSubMenu->name.value = L"EnsureToolstripSubMenu";
+						auto refEnsureToolstripSubMenu = MakePtr<WfMemberExpression>();
+						refEnsureToolstripSubMenu->parent = refControl;
+						refEnsureToolstripSubMenu->name.value = L"EnsureToolstripSubMenu";
 
-							auto call = MakePtr<WfCallExpression>();
-							call->function = refEnsureToolstripSubMenu;
+						auto call = MakePtr<WfCallExpression>();
+						call->function = refEnsureToolstripSubMenu;
 
-							return call;
-						}
+						return call;
 					}
 					return nullptr;
 				}
@@ -10576,7 +10573,32 @@ WorkflowReferenceNamesVisitor
 
 								if (auto propInfo = resolvedTypeInfo.typeDescriptor->GetPropertyByName(prop.ToString(), true))
 								{
-									resolvingResult.typeOverrides.Add(setTarget->instanceName, CopyTypeInfo(propInfo->GetReturn()));
+									auto propType = propInfo->GetReturn();
+									if (propType->GetTypeDescriptor() == td)
+									{
+										resolvingResult.typeOverrides.Add(setTarget->instanceName, CopyTypeInfo(propInfo->GetReturn()));
+									}
+									else
+									{
+										switch (propType->GetDecorator())
+										{
+										case ITypeInfo::Nullable:
+										case ITypeInfo::RawPtr:
+										case ITypeInfo::SharedPtr:
+											{
+												auto elementType = MakePtr<TypeInfoImpl>(ITypeInfo::TypeDescriptor);
+												elementType->SetTypeDescriptor(td);
+
+												auto decoratedType = MakePtr<TypeInfoImpl>(propType->GetDecorator());
+												decoratedType->SetElementType(elementType);
+												
+												resolvingResult.typeOverrides.Add(setTarget->instanceName, decoratedType);
+											}
+											break;
+										default:
+											resolvingResult.typeOverrides.Add(setTarget->instanceName, CopyTypeInfo(propInfo->GetReturn()));
+										}
+									}
 								}
 							}
 							else
diff --git a/Tools/GacGen.exe b/Tools/GacGen.exe
index 6b7f87d0..7b220984 100644
Binary files a/Tools/GacGen.exe and b/Tools/GacGen.exe differ
diff --git a/Tutorial/GacUI_HelloWorlds/UIRes/MVVM.bin b/Tutorial/GacUI_HelloWorlds/UIRes/MVVM.bin
index 6ad268b8..660e1d49 100644
Binary files a/Tutorial/GacUI_HelloWorlds/UIRes/MVVM.bin and b/Tutorial/GacUI_HelloWorlds/UIRes/MVVM.bin differ
diff --git a/Tutorial/GacUI_Layout/UIRes/RichTextEmbedding.bin b/Tutorial/GacUI_Layout/UIRes/RichTextEmbedding.bin
index 6911aac8..0bb93fbe 100644
Binary files a/Tutorial/GacUI_Layout/UIRes/RichTextEmbedding.bin and b/Tutorial/GacUI_Layout/UIRes/RichTextEmbedding.bin differ