add ContributorView

HandyControlDemo/Data/MessageToken.tt

@@ -69,5 +69,11 @@ namespace HandyControlDemo.Data
 
     <#}#>
 	public static readonly string LoadShowContent = nameof(LoadShowContent);
+
+	public static readonly string FullSwitch = nameof(FullSwitch);
+
+	public static readonly string ContributorsView = nameof(ContributorsView);
+
+	public static readonly string ClearLeftSelected = nameof(ClearLeftSelected);
 	}
 }