optimized performance

src/Shared/HandyControlDemo_Shared/App.xaml.cs

@@ -6,6 +6,7 @@ using System.Net;
 using System.Security.Authentication; 
 using System.Threading;
 using System.Windows;
+using System.Windows.Media.Animation;
 using HandyControl.Data;
 using HandyControl.Tools;
 using HandyControlDemo.Data;