completed the branch

src/Shared/HandyControlDemo_Shared/ViewModel/ViewModelLocator.cs

@@ -39,6 +39,7 @@ namespace HandyControlDemo.ViewModel
             SimpleIoc.Default.Register<TabControlDemoViewModel>();
             SimpleIoc.Default.Register<NoUserViewModel>();
             SimpleIoc.Default.Register<CardDemoViewModel>();
+            SimpleIoc.Default.Register<SpriteDemoViewModel>();
         }
 
         public static ViewModelLocator Instance => new Lazy<ViewModelLocator>(() =>
@@ -90,6 +91,8 @@ namespace HandyControlDemo.ViewModel
 
         public CardDemoViewModel CardDemo => new CardDemoViewModel(ServiceLocator.Current.GetInstance<DataService>());
 
+        public SpriteDemoViewModel SpriteDemo => ServiceLocator.Current.GetInstance<SpriteDemoViewModel>();
+
         #endregion
     }
 }