add RepeatButton demo

src/Shared/HandyControlDemo_Shared/Data/MessageToken.cs

@@ -94,6 +94,8 @@
 	
         public static readonly string ButtonDemoCtl = nameof(ButtonDemoCtl);
 
+        public static readonly string RepeatButtonDemoCtl = nameof(RepeatButtonDemoCtl);
+
         public static readonly string ToggleButtonDemoCtl = nameof(ToggleButtonDemoCtl);
 
         public static readonly string ExpanderDemoCtl = nameof(ExpanderDemoCtl);