diff --git a/example/Vulkan/VulkanAppFramework.h b/example/Vulkan/VulkanAppFramework.h
index e3934018..9e947603 100644
--- a/example/Vulkan/VulkanAppFramework.h
+++ b/example/Vulkan/VulkanAppFramework.h
@@ -82,9 +82,18 @@ public:
         device->QueuePresent();
     }
 
+    virtual void Draw()=0;
+
     bool Run()
     {
-        win->MessageProc();
-        return !win->IsClose();
+        if(!win->Update())return(false);
+
+        if(win->IsVisible())
+        {
+            AcquireNextFrame();
+            Draw();
+        }
+
+        return(true);
     }
 };//class VulkanApplicationFramework
diff --git a/example/Vulkan/main.cpp b/example/Vulkan/main.cpp
index f7548389..8e7671ca 100644
--- a/example/Vulkan/main.cpp
+++ b/example/Vulkan/main.cpp
@@ -157,9 +157,8 @@ public:
         return(true);
     }
 
-    void Draw()
+    void Draw() override
     {
-        AcquireNextFrame();
         Submit(cmd_buf[device->GetCurrentFrameIndices()]);
     }
 };//class TestApp:public VulkanApplicationFramework
@@ -176,8 +175,7 @@ int main(int,char **)
     if(!app.Init())
         return(-1);
 
-    while(app.Run())
-        app.Draw();
+    while(app.Run());
     
     return 0;
 }
diff --git a/inc/hgl/platform/Window.h b/inc/hgl/platform/Window.h
index b07caa59..9201efbe 100644
--- a/inc/hgl/platform/Window.h
+++ b/inc/hgl/platform/Window.h
@@ -19,6 +19,11 @@ namespace hgl
 
         bool key_push[kbRangeSize];
 
+    protected:
+
+        virtual bool MessageProc()=0;
+        virtual bool WaitMessage()=0;
+
     public:
 
         uint GetWidth()const{return width;}
@@ -64,6 +69,7 @@ namespace hgl
         virtual void Close()=0;
 
                 bool IsClose()const{return is_close;}
+                bool IsVisible()const{return (!is_close)&&width&&height;}
 
         virtual void SetCaption(const OSString &)=0;
 
@@ -75,7 +81,7 @@ namespace hgl
 
         virtual void SetSystemCursor(bool){}
 
-        virtual bool MessageProc()=0;
+        virtual bool Update();
     };//class Window
 
     Window *CreateRenderWindow(const OSString &win_name);
diff --git a/src/Platform/Win/WinWindow.cpp b/src/Platform/Win/WinWindow.cpp
index 2475938c..9e98121f 100644
--- a/src/Platform/Win/WinWindow.cpp
+++ b/src/Platform/Win/WinWindow.cpp
@@ -192,6 +192,11 @@ namespace hgl
         }
     }
 
+    bool WinWindow::WaitMessage()
+    {
+        return ::WaitMessage();
+    }
+
 	Window *CreateRenderWindow(const WideString& win_name)
 	{
 		return(new WinWindow(win_name));
diff --git a/src/Platform/Win/WinWindow.h b/src/Platform/Win/WinWindow.h
index a44656ab..05a0560d 100644
--- a/src/Platform/Win/WinWindow.h
+++ b/src/Platform/Win/WinWindow.h
@@ -46,5 +46,6 @@ namespace hgl
         void SetSystemCursor(bool visible) override;
 
         bool MessageProc() override;
+        bool WaitMessage() override;
     };//class WinWindow :public Window
 }//namespace win
diff --git a/src/Platform/Window.cpp b/src/Platform/Window.cpp
index 99a08503..ce3cf4b1 100644
--- a/src/Platform/Window.cpp
+++ b/src/Platform/Window.cpp
@@ -17,4 +17,16 @@ namespace hgl
         OnKeyUp(kb);
         key_push[kb]=false;
     }
+
+    bool Window::Update()
+    {
+        while(MessageProc())
+        {
+        }
+
+        if(!active||width==0||height==0)
+            this->WaitMessage();
+
+        return(!is_close);
+    }
 }//namespace hgl