diff --git a/Tools/GacGen.ps1 b/Tools/GacGen.ps1
index 53d06deb..f3cd662f 100644
--- a/Tools/GacGen.ps1
+++ b/Tools/GacGen.ps1
@@ -8,10 +8,12 @@ Write-Host "Compiling GacUI Resource: $FileName ..."
 Start-Process-And-Wait (,("$PSScriptRoot\GacGen32.exe", "/P $FileName"))
 Start-Process-And-Wait (,("$PSScriptRoot\GacGen64.exe", "/P $FileName"))
 
-if (Test-Path -Path "$($FileName).log\x32\Error.txt") {
+if (Test-Path -Path "$($FileName).log\x32\Errors.txt") {
+    Write-Host (Get-Content "$($FileName).log\x32\Errors.txt") -ForegroundColor Red -Separator "`r`n"
     throw "Failed to compile GacUI Resource (x86): $FileName"
 }
-if (Test-Path -Path "$($FileName).log\x64\Error.txt") {
+if (Test-Path -Path "$($FileName).log\x64\Errors.txt") {
+    Write-Host (Get-Content "$($FileName).log\x64\Errors.txt") -ForegroundColor Red -Separator "`r`n"
     throw "Failed to compile GacUI Resource (x64): $FileName"
 }
     
diff --git a/Tutorial/GacUI_Controls/AddressBook/UI/Resource.xml b/Tutorial/GacUI_Controls/AddressBook/UI/Resource.xml
index a963bbda..5a7ed528 100644
--- a/Tutorial/GacUI_Controls/AddressBook/UI/Resource.xml
+++ b/Tutorial/GacUI_Controls/AddressBook/UI/Resource.xml
@@ -136,8 +136,9 @@
               <![CDATA[
                 $Async{
                   var contact = ViewModel.CreateContact();
-                  var window = new demo::NewContactWindow*(contact);
+                  var window = new demo::NewContactWindow*();
                   window.MoveToScreenCenter();
+                  window.SetContact(contact);
                   $Await window.ShowModalAsync(self);
                   
                   if (window.Ready)
@@ -154,9 +155,10 @@
             <ev.Executed-eval>
               <![CDATA[
                 $Async{
-                  var window = new demo::NewContactWindow*(ViewModel.SelectedContact);
+                  var window = new demo::NewContactWindow*();
                   window.ForEdit = true;
                   window.MoveToScreenCenter();
+                  window.SetContact(ViewModel.SelectedContact);
                   $Await window.ShowModalAsync(self);
                   delete window;
                 }
@@ -352,12 +354,21 @@
 
     <Instance name="NewContactWindowResource">
       <Instance ref.CodeBehind="false" ref.Class="demo::NewContactWindow">
-        <ref.Parameter Name="Contact" Class="demo::IContact"/>
         <ref.Members>
           <![CDATA[
             prop ForEdit : bool = false {}
           
             var Ready : bool = false;
+            var contact : IContact^ = null;
+            
+            func SetContact(value : IContact^): void
+            {
+              contact = value;
+              textBoxName.Text = contact.Name;
+              textBoxPhone.Text = contact.Phone;
+              textBoxAddress.Text = contact.Address;
+              datePickerBirthday.Date = contact.Birthday;
+            }
           ]]>
         </ref.Members>
         <Window ref.Name="self" Text-bind="self.ForEdit ? 'Edit Contact' : 'New Contact'" ClientSize="x:480 y:400" MaximizedBox="false" MinimizedBox="false" SizeBox="false">
@@ -382,7 +393,7 @@
               <Label Text="Name:"/>
             </Cell>
             <Cell Site="row:0 column:1 columnSpan:3">
-              <DocumentTextBox ref.Name="textBoxName" EditMode="Editable" Text-eval="Contact.Name">
+              <DocumentTextBox ref.Name="textBoxName" EditMode="Editable">
                 <att.BoundsComposition-set AlignmentToParent="left:0 top:0 right:0 bottom:0"/>
               </DocumentTextBox>
             </Cell>
@@ -391,7 +402,7 @@
               <Label Text="Phone:"/>
             </Cell>
             <Cell Site="row:1 column:1 columnSpan:3">
-              <DocumentTextBox ref.Name="textBoxPhone" EditMode="Editable" Text-eval="Contact.Phone">
+              <DocumentTextBox ref.Name="textBoxPhone" EditMode="Editable">
                 <att.BoundsComposition-set AlignmentToParent="left:0 top:0 right:0 bottom:0"/>
               </DocumentTextBox>
             </Cell>
@@ -400,7 +411,7 @@
               <Label Text="Address:"/>
             </Cell>
             <Cell Site="row:2 column:1 columnSpan:3">
-              <DocumentTextBox ref.Name="textBoxAddress" EditMode="Editable" Text-eval="Contact.Address">
+              <DocumentTextBox ref.Name="textBoxAddress" EditMode="Editable">
                 <att.BoundsComposition-set AlignmentToParent="left:0 top:0 right:0 bottom:0"/>
               </DocumentTextBox>
             </Cell>
@@ -409,7 +420,7 @@
               <Label Text="Birthday:"/>
             </Cell>
             <Cell Site="row:3 column:1 columnSpan:3">
-              <DatePicker ref.Name="datePickerBirthday" Date-eval="Contact.Birthday">
+              <DatePicker ref.Name="datePickerBirthday">
                 <att.BoundsComposition-set AlignmentToParent="left:0 top:0 bottom:0"/>
               </DatePicker>
             </Cell>
@@ -420,7 +431,7 @@
                 <ev.Clicked-eval>
                   <![CDATA[
                     {
-                      Contact.Update(textBoxName.Text, datePickerBirthday.Date, textBoxPhone.Text, textBoxAddress.Text);
+                      self.contact.Update(textBoxName.Text, datePickerBirthday.Date, textBoxPhone.Text, textBoxAddress.Text);
                       self.Ready = true;
                       self.Close();
                     }
diff --git a/Tutorial/GacUI_Controls/AddressBook/UI/Source/DemoPartialClasses.cpp b/Tutorial/GacUI_Controls/AddressBook/UI/Source/DemoPartialClasses.cpp
index 1816da17..060cd6f5 100644
--- a/Tutorial/GacUI_Controls/AddressBook/UI/Source/DemoPartialClasses.cpp
+++ b/Tutorial/GacUI_Controls/AddressBook/UI/Source/DemoPartialClasses.cpp
@@ -403,7 +403,7 @@ Closures
 
 	void __vwsnf32_Demo_demo_NewContactWindowConstructor___vwsn_initialize_instance__::operator()(::vl::presentation::compositions::GuiGraphicsComposition* sender, ::vl::presentation::compositions::GuiEventArgs* arguments) const
 	{
-		::vl::__vwsn::This(__vwsnthis_0->Contact.Obj())->Update(::vl::__vwsn::This(__vwsnthis_0->textBoxName)->GetText(), ::vl::__vwsn::This(__vwsnthis_0->datePickerBirthday)->GetDate(), ::vl::__vwsn::This(__vwsnthis_0->textBoxPhone)->GetText(), ::vl::__vwsn::This(__vwsnthis_0->textBoxAddress)->GetText());
+		::vl::__vwsn::This(::vl::__vwsn::This(__vwsnthis_0->self)->contact.Obj())->Update(::vl::__vwsn::This(__vwsnthis_0->textBoxName)->GetText(), ::vl::__vwsn::This(__vwsnthis_0->datePickerBirthday)->GetDate(), ::vl::__vwsn::This(__vwsnthis_0->textBoxPhone)->GetText(), ::vl::__vwsn::This(__vwsnthis_0->textBoxAddress)->GetText());
 		(::vl::__vwsn::This(__vwsnthis_0->self)->Ready = true);
 		::vl::__vwsn::This(__vwsnthis_0->self)->Close();
 	}
@@ -1110,8 +1110,9 @@ Closures
 					if ((__vwsn_co_state_ == static_cast<::vl::vint>(0)))
 					{
 						(__vwsn_co0_contact = ::vl::__vwsn::This(__vwsnthis_0->ViewModel.Obj())->CreateContact());
-						(__vwsn_co1_window = new ::demo::NewContactWindow(__vwsn_co0_contact));
+						(__vwsn_co1_window = new ::demo::NewContactWindow());
 						::vl::__vwsn::This(__vwsn_co1_window)->MoveToScreenCenter();
+						::vl::__vwsn::This(__vwsn_co1_window)->SetContact(__vwsn_co0_contact);
 						(__vwsn_co_state_ = static_cast<::vl::vint>(2));
 						continue;
 					}
@@ -1259,9 +1260,10 @@ Closures
 				{
 					if ((__vwsn_co_state_ == static_cast<::vl::vint>(0)))
 					{
-						(__vwsn_co0_window = new ::demo::NewContactWindow(::vl::__vwsn::This(__vwsnthis_0->ViewModel.Obj())->GetSelectedContact()));
+						(__vwsn_co0_window = new ::demo::NewContactWindow());
 						::vl::__vwsn::This(__vwsn_co0_window)->SetForEdit(true);
 						::vl::__vwsn::This(__vwsn_co0_window)->MoveToScreenCenter();
+						::vl::__vwsn::This(__vwsn_co0_window)->SetContact(::vl::__vwsn::This(__vwsnthis_0->ViewModel.Obj())->GetSelectedContact());
 						(__vwsn_co_state_ = static_cast<::vl::vint>(2));
 						continue;
 					}
@@ -2000,7 +2002,6 @@ Class (::demo::NewContactWindowConstructor)
 	void NewContactWindowConstructor::__vwsn_initialize_instance_(::demo::NewContactWindow* __vwsn_this_)
 	{
 		(this->self = __vwsn_this_);
-		(this->Contact = ::vl::__vwsn::This(__vwsn_this_)->GetContact());
 		{
 			::vl::__vwsn::This(this->self)->SetSizeBox(::vl::__vwsn::Parse<bool>(::vl::WString(L"false", false)));
 		}
@@ -2239,18 +2240,6 @@ Class (::demo::NewContactWindowConstructor)
 		{
 			::vl::__vwsn::This(::vl::__vwsn::This(this->self)->GetContainerComposition())->AddChild(static_cast<::vl::presentation::compositions::GuiGraphicsComposition*>(this->__vwsn_precompile_0));
 		}
-		{
-			::vl::__vwsn::This(this->textBoxName)->SetText(::vl::__vwsn::This(this->Contact.Obj())->GetName());
-		}
-		{
-			::vl::__vwsn::This(this->textBoxPhone)->SetText(::vl::__vwsn::This(this->Contact.Obj())->GetPhone());
-		}
-		{
-			::vl::__vwsn::This(this->textBoxAddress)->SetText(::vl::__vwsn::This(this->Contact.Obj())->GetAddress());
-		}
-		{
-			::vl::__vwsn::This(this->datePickerBirthday)->SetDate(::vl::__vwsn::This(this->Contact.Obj())->GetBirthday());
-		}
 		{
 			auto __vwsn_event_handler_ = LAMBDA(::vl_workflow_global::__vwsnf32_Demo_demo_NewContactWindowConstructor___vwsn_initialize_instance__(this));
 			::vl::__vwsn::EventAttach(::vl::__vwsn::This(this->__vwsn_precompile_18)->Clicked, __vwsn_event_handler_);
@@ -2287,15 +2276,18 @@ Class (::demo::NewContactWindow)
 		}
 	}
 
-	::vl::Ptr<::demo::IContact> NewContactWindow::GetContact()
+	void NewContactWindow::SetContact(::vl::Ptr<::demo::IContact> value)
 	{
-		return this->__vwsn_parameter_Contact;
+		(this->contact = value);
+		::vl::__vwsn::This(this->textBoxName)->SetText(::vl::__vwsn::This(this->contact.Obj())->GetName());
+		::vl::__vwsn::This(this->textBoxPhone)->SetText(::vl::__vwsn::This(this->contact.Obj())->GetPhone());
+		::vl::__vwsn::This(this->textBoxAddress)->SetText(::vl::__vwsn::This(this->contact.Obj())->GetAddress());
+		::vl::__vwsn::This(this->datePickerBirthday)->SetDate(::vl::__vwsn::This(this->contact.Obj())->GetBirthday());
 	}
 
-	NewContactWindow::NewContactWindow(::vl::Ptr<::demo::IContact> __vwsn_ctor_parameter_Contact)
+	NewContactWindow::NewContactWindow()
 		: ::vl::presentation::controls::GuiWindow(::vl::presentation::theme::ThemeName::Window)
 	{
-		(this->__vwsn_parameter_Contact = __vwsn_ctor_parameter_Contact);
 		auto __vwsn_resource_ = ::vl::__vwsn::This(::vl::presentation::GetResourceManager())->GetResourceFromClassName(::vl::WString(L"demo::NewContactWindow", false));
 		auto __vwsn_resolver_ = ::vl::Ptr<::vl::presentation::GuiResourcePathResolver>(new ::vl::presentation::GuiResourcePathResolver(__vwsn_resource_, ::vl::__vwsn::This(__vwsn_resource_.Obj())->GetWorkingDirectory()));
 		::vl::__vwsn::This(this)->SetResourceResolver(__vwsn_resolver_);
diff --git a/Tutorial/GacUI_Controls/AddressBook/UI/Source/DemoPartialClasses.h b/Tutorial/GacUI_Controls/AddressBook/UI/Source/DemoPartialClasses.h
index 5283360a..4a1b776f 100644
--- a/Tutorial/GacUI_Controls/AddressBook/UI/Source/DemoPartialClasses.h
+++ b/Tutorial/GacUI_Controls/AddressBook/UI/Source/DemoPartialClasses.h
@@ -209,7 +209,6 @@ namespace demo
 	protected:
 		::demo::NewContactWindow* self = static_cast<::demo::NewContactWindow*>(nullptr);
 		::vl::presentation::controls::GuiDocumentLabel* textBoxName = static_cast<::vl::presentation::controls::GuiDocumentLabel*>(nullptr);
-		::vl::Ptr<::demo::IContact> Contact = ::vl::Ptr<::demo::IContact>();
 		::vl::presentation::controls::GuiDocumentLabel* textBoxPhone = static_cast<::vl::presentation::controls::GuiDocumentLabel*>(nullptr);
 		::vl::presentation::controls::GuiDocumentLabel* textBoxAddress = static_cast<::vl::presentation::controls::GuiDocumentLabel*>(nullptr);
 		::vl::presentation::controls::GuiDatePicker* datePickerBirthday = static_cast<::vl::presentation::controls::GuiDatePicker*>(nullptr);
@@ -258,9 +257,9 @@ namespace demo
 		void SetForEdit(bool __vwsn_value_);
 		::vl::Event<void()> ForEditChanged;
 		bool Ready = false;
-		::vl::Ptr<::demo::IContact> __vwsn_parameter_Contact = ::vl::Ptr<::demo::IContact>();
-		::vl::Ptr<::demo::IContact> GetContact();
-		NewContactWindow(::vl::Ptr<::demo::IContact> __vwsn_ctor_parameter_Contact);
+		::vl::Ptr<::demo::IContact> contact = ::vl::Ptr<::demo::IContact>();
+		void SetContact(::vl::Ptr<::demo::IContact> value);
+		NewContactWindow();
 		~NewContactWindow();
 	};
 
diff --git a/Tutorial/GacUI_Controls/AddressBook/UI/Source/DemoReflection.cpp b/Tutorial/GacUI_Controls/AddressBook/UI/Source/DemoReflection.cpp
index e27e5b10..89f2440f 100644
--- a/Tutorial/GacUI_Controls/AddressBook/UI/Source/DemoReflection.cpp
+++ b/Tutorial/GacUI_Controls/AddressBook/UI/Source/DemoReflection.cpp
@@ -159,16 +159,15 @@ namespace vl
 			END_CLASS_MEMBER(::demo::MainWindowConstructor)
 
 			BEGIN_CLASS_MEMBER(::demo::NewContactWindow)
-				CLASS_MEMBER_CONSTRUCTOR(::demo::NewContactWindow*(::vl::Ptr<::demo::IContact>), { L"__vwsn_ctor_parameter_Contact" })
-				CLASS_MEMBER_METHOD(GetContact, NO_PARAMETER)
+				CLASS_MEMBER_CONSTRUCTOR(::demo::NewContactWindow*(), NO_PARAMETER)
 				CLASS_MEMBER_METHOD(GetForEdit, NO_PARAMETER)
+				CLASS_MEMBER_METHOD(SetContact, { L"value" })
 				CLASS_MEMBER_METHOD(SetForEdit, { L"__vwsn_value_" })
 				CLASS_MEMBER_EVENT(ForEditChanged)
-				CLASS_MEMBER_FIELD(__vwsn_parameter_Contact)
 				CLASS_MEMBER_FIELD(__vwsn_prop_ForEdit)
-				CLASS_MEMBER_PROPERTY_READONLY(Contact, GetContact)
 				CLASS_MEMBER_PROPERTY_EVENT(ForEdit, GetForEdit, SetForEdit, ForEditChanged)
 				CLASS_MEMBER_FIELD(Ready)
+				CLASS_MEMBER_FIELD(contact)
 			END_CLASS_MEMBER(::demo::NewContactWindow)
 
 			BEGIN_CLASS_MEMBER(::demo::NewContactWindowConstructor)
@@ -198,7 +197,6 @@ namespace vl
 				CLASS_MEMBER_FIELD(__vwsn_precompile_7)
 				CLASS_MEMBER_FIELD(__vwsn_precompile_8)
 				CLASS_MEMBER_FIELD(__vwsn_precompile_9)
-				CLASS_MEMBER_FIELD(Contact)
 				CLASS_MEMBER_FIELD(datePickerBirthday)
 				CLASS_MEMBER_FIELD(self)
 				CLASS_MEMBER_FIELD(textBoxAddress)