add style demo

src/Shared/HandyControlDemo_Shared/Data/MessageToken.cs

@@ -170,5 +170,7 @@
 
         public static readonly string MainWindow = nameof(MainWindow);
 
+        public static readonly string OverView = nameof(OverView);
+
     }
 }

src/Shared/HandyControlDemo_Shared/Data/MessageToken.tt

@@ -96,7 +96,8 @@ var messageList = new List<string>
 	"SendChatMessage",
 	"GrowlDemoPanel",
 	"DialogDemoWindow",
-	"MainWindow"
+	"MainWindow",
+	"OverView"
 };
 #>
 namespace HandyControlDemo.Data