add PreviewSlider

HandyControlDemo/Data/MessageToken.cs

@@ -34,6 +34,8 @@
 
         public static readonly string ScrollViewerDemoCtl = nameof(ScrollViewerDemoCtl);
 
+        public static readonly string PreviewSliderDemoCtl = nameof(PreviewSliderDemoCtl);
+
         public static readonly string ButtonDemoCtl = nameof(ButtonDemoCtl);
 
         public static readonly string ToggleButtonDemoCtl = nameof(ToggleButtonDemoCtl);

HandyControlDemo/Data/MessageToken.tt

@@ -19,7 +19,8 @@ var controlList = new List<string>
 	"CirclePanelDemoCtl",
 	"NumericUpDownDemoCtl",
 	"WindowDemoCtl",
-	"ScrollViewerDemoCtl"
+	"ScrollViewerDemoCtl",
+	"PreviewSliderDemoCtl"
 };
 var styleList = new List<string>
 {