diff --git a/example/Basic/rf_test.cpp b/example/Basic/rf_test.cpp
index dcfb6f4b..6e47375f 100644
--- a/example/Basic/rf_test.cpp
+++ b/example/Basic/rf_test.cpp
@@ -157,10 +157,10 @@ int main(int,char **)
 
     WorkManager wm(&rf);
 
-    AutoDelete<TestApp> app=new TestApp(&rf);
+    TestApp *test=new TestApp(&rf);
 
-    if(!app->Init())
+    if(!test->Init())
         return(-2);
 
-    wm.Start(app);
+    wm.Start(test);
 }
diff --git a/example/common/WorkObject.h b/example/common/WorkObject.h
index 463d0557..5bc3ee61 100644
--- a/example/common/WorkObject.h
+++ b/example/common/WorkObject.h
@@ -65,6 +65,7 @@ namespace hgl
 
         double last_update_time=0;
         double last_render_time=0;
+        double cur_time=0;
 
         WorkObject *cur_work_object=nullptr;
 
@@ -88,29 +89,23 @@ namespace hgl
 
         void Update(WorkObject *wo)
         {
-            double cur_time=GetDoubleTime();
-            double delta_time;
+            double delta_time=cur_time-last_update_time;
 
-            if(wo->IsTickable())
+            if(delta_time>=frame_time)
             {
-                delta_time=cur_time-last_update_time;
-
-                if(delta_time>=frame_time)
-                {
-                    last_update_time=cur_time;
-                    wo->Tick(delta_time);
-                }
+                last_update_time=cur_time;
+                wo->Tick(delta_time);
             }
+        }
 
-            if(wo->IsRenderable())
+        void Render(WorkObject *wo)
+        {
+            double delta_time=cur_time-last_render_time;
+
+            if(delta_time>=frame_time)
             {
-                delta_time=cur_time-last_render_time;
-
-                if(delta_time>=frame_time)
-                {
-                    last_render_time=cur_time;
-                    wo->Render(delta_time);
-                }
+                last_render_time=cur_time;
+                wo->Render(delta_time);
             }
         }
 
@@ -119,12 +114,24 @@ namespace hgl
             if(!cur_work_object)
                 return;
 
+            Window *win=render_framework->GetWindow();
+            graph::GPUDevice *dev=render_framework->GetDevice();
+
             while(!cur_work_object->IsDestroy())
             {
-                Update(cur_work_object);
+                cur_time=GetDoubleTime();
 
-                render_framework->GetWindow()->Update();
-                render_framework->GetDevice()->WaitIdle();
+                if(cur_work_object->IsTickable())
+                    Update(cur_work_object);
+
+                if(win->IsVisible()&&cur_work_object->IsRenderable())
+                {
+                    Render(cur_work_object);
+                    dev->WaitIdle();
+                }
+
+                if(!win->Update())
+                    break;
             }
         }
 
diff --git a/res b/res
index 475d8ad4..e1a36d78 160000
--- a/res
+++ b/res
@@ -1 +1 @@
-Subproject commit 475d8ad43ceee084cd24f5d0bed59de9f6aa36fd
+Subproject commit e1a36d78f0eead5f6bb65493432c4690637b991d