diff --git a/Tools/GacGen.exe b/Tools/GacGen.exe
index 833527a1..315c27c5 100644
Binary files a/Tools/GacGen.exe and b/Tools/GacGen.exe differ
diff --git a/Tools/ParserGen.exe b/Tools/ParserGen.exe
index b5d36680..bd972010 100644
Binary files a/Tools/ParserGen.exe and b/Tools/ParserGen.exe differ
diff --git a/Tutorial/Codegen.bat b/Tutorial/Codegen.bat
new file mode 100644
index 00000000..c1fd42bc
--- /dev/null
+++ b/Tutorial/Codegen.bat
@@ -0,0 +1,8 @@
+pushd GacUI_HelloWorlds
+pushd CppXml\UI
+call Codegen.bat
+popd
+pushd MVVM\UI
+call Codegen.bat
+popd
+popd
\ No newline at end of file
diff --git a/Tutorial/GacUI_HelloWorlds/CppXml/UI/Source/HelloWorldPartialClasses.cpp b/Tutorial/GacUI_HelloWorlds/CppXml/UI/Source/HelloWorldPartialClasses.cpp
index 1c29cfab..6e19f328 100644
--- a/Tutorial/GacUI_HelloWorlds/CppXml/UI/Source/HelloWorldPartialClasses.cpp
+++ b/Tutorial/GacUI_HelloWorlds/CppXml/UI/Source/HelloWorldPartialClasses.cpp
@@ -20,6 +20,11 @@ namespace helloworld
 	{
 		InitializeComponents();
 	}
+
+	MainWindow::~MainWindow()
+	{
+		ClearSubscriptions();
+	}
 }
 
 
diff --git a/Tutorial/GacUI_HelloWorlds/CppXml/UI/Source/HelloWorldPartialClasses.h b/Tutorial/GacUI_HelloWorlds/CppXml/UI/Source/HelloWorldPartialClasses.h
index 4d9963d7..176e6533 100644
--- a/Tutorial/GacUI_HelloWorlds/CppXml/UI/Source/HelloWorldPartialClasses.h
+++ b/Tutorial/GacUI_HelloWorlds/CppXml/UI/Source/HelloWorldPartialClasses.h
@@ -65,6 +65,7 @@ namespace helloworld
 		// #endregion CLASS_MEMBER_GUIEVENT_HANDLER
 	public:
 		MainWindow();
+		~MainWindow();
 	};
 }
 
diff --git a/Tutorial/GacUI_HelloWorlds/MVVM/Main.cpp b/Tutorial/GacUI_HelloWorlds/MVVM/Main.cpp
index 61aa4b56..57c703e7 100644
--- a/Tutorial/GacUI_HelloWorlds/MVVM/Main.cpp
+++ b/Tutorial/GacUI_HelloWorlds/MVVM/Main.cpp
@@ -82,7 +82,9 @@ void GuiMain()
 		auto resource = GuiResource::LoadPrecompiledBinary(fileStream, errors);
 		GetInstanceLoaderManager()->SetResource(L"Resource", resource);
 	}
-	helloworld::MainWindow window(new ViewModel);
-	window.MoveToScreenCenter();
-	GetApplication()->Run(&window);
+	auto viewModel = MakePtr<ViewModel>();
+	auto window = new helloworld::MainWindow(viewModel);
+	window->MoveToScreenCenter();
+	GetApplication()->Run(window);
+	delete window;
 }
\ No newline at end of file
diff --git a/Tutorial/GacUI_HelloWorlds/MVVM/UI/Source/MainWindow.cpp b/Tutorial/GacUI_HelloWorlds/MVVM/UI/Source/MainWindow.cpp
index 09b3d075..1874905f 100644
--- a/Tutorial/GacUI_HelloWorlds/MVVM/UI/Source/MainWindow.cpp
+++ b/Tutorial/GacUI_HelloWorlds/MVVM/UI/Source/MainWindow.cpp
@@ -27,4 +27,9 @@ namespace helloworld
 	{
 		InitializeComponents(ViewModel);
 	}
+
+	MainWindow::~MainWindow()
+	{
+		ClearSubscriptions();
+	}
 }
diff --git a/Tutorial/GacUI_HelloWorlds/MVVM/UI/Source/MainWindow.h b/Tutorial/GacUI_HelloWorlds/MVVM/UI/Source/MainWindow.h
index 2596720b..7413c7b3 100644
--- a/Tutorial/GacUI_HelloWorlds/MVVM/UI/Source/MainWindow.h
+++ b/Tutorial/GacUI_HelloWorlds/MVVM/UI/Source/MainWindow.h
@@ -24,6 +24,7 @@ namespace helloworld
 		// #endregion CLASS_MEMBER_GUIEVENT_HANDLER
 	public:
 		MainWindow(Ptr<vm::IViewModel> ViewModel);
+		~MainWindow();
 	};
 }
 
diff --git a/Tutorial/GacUI_HelloWorlds/UIRes/MVVM.bin b/Tutorial/GacUI_HelloWorlds/UIRes/MVVM.bin
index d6f2187e..f71fea79 100644
Binary files a/Tutorial/GacUI_HelloWorlds/UIRes/MVVM.bin and b/Tutorial/GacUI_HelloWorlds/UIRes/MVVM.bin differ
diff --git a/Tutorial/GacUI_HelloWorlds/WorkflowScript/Main.cpp b/Tutorial/GacUI_HelloWorlds/WorkflowScript/Main.cpp
index 6b0c6809..52d667a8 100644
--- a/Tutorial/GacUI_HelloWorlds/WorkflowScript/Main.cpp
+++ b/Tutorial/GacUI_HelloWorlds/WorkflowScript/Main.cpp
@@ -1,11 +1,62 @@
-#include <GacUI.h>
+#include <GacUIReflection.h>
 #include <Windows.h>
 
+using namespace vl::parsing;
+using namespace vl::collections;
+using namespace vl::workflow;
+using namespace vl::workflow::analyzer;
+using namespace vl::workflow::runtime;
+
 int CALLBACK WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int CmdShow)
 {
 	return SetupWindowsDirect2DRenderer();
 }
 
+const wchar_t* WorkflowScript = LR"workflow(
+
+module helloworld;
+
+using presentation::*;
+using presentation::controls::Gui*;
+using presentation::theme::*;
+
+func CreateMainWindow() : Window*
+{
+	var theme = ITheme::GetCurrentTheme();
+
+	var window = new Window*(theme.CreateWindowStyle());
+	window.Text = "Hello, world!";
+	window.ClientSize = cast Size "x:480 y:320";
+	window.BoundsComposition.PreferredMinSize = cast Size "x:480 y:320";
+	window.MoveToScreenCenter();
+
+	var label = new Label*(theme.CreateLabelStyle());
+	label.Text = "Welcom to GacUI Library!";
+	label.Font = cast FontProperties "fontFamily:{Segoe UI} size:32";
+	window.AddChild(label);
+
+	return window;
+}
+
+)workflow";
+
 void GuiMain()
 {
+	Ptr<WfRuntimeGlobalContext> globalContext;
+	{
+		List<Ptr<ParsingError>> errors;
+		List<WString> codes;
+		codes.Add(WorkflowScript);
+		auto table = WfLoadTable();
+		auto assembly = Compile(table, codes, errors);
+		globalContext = MakePtr<WfRuntimeGlobalContext>(assembly);
+		LoadFunction<void()>(globalContext, L"<initialize>")();
+	}
+
+	auto CreateMainWindow = LoadFunction<GuiWindow*()>(globalContext, L"CreateMainWindow");
+
+	auto window = CreateMainWindow();
+	window->MoveToScreenCenter();
+	GetApplication()->Run(window);
+	delete window;
 }
\ No newline at end of file