         if (!thumb)
         {
             thumb = new Button();
-            thumb.setStyle("skinClass", spark.skins.mobile.VScrollBarThumbSkin);
+            thumb.setStyle("skinClass", thumbSkinClass);
             thumb.width = layoutMeasuredWidth;
             thumb.height = layoutMeasuredWidth;
             addChild(thumb);
         }
     }
-
+    
     /**
      *  @private 
      */

        measuredWidth = layoutMeasuredWidth;
        measuredHeight = layoutMeasuredHeight;
    }

    /**
     *  @private 
     */

    //  Variables
    //
    //--------------------------------------------------------------------------
    
    /** 
     *  @copy spark.skins.spark.ApplicationSkin#hostComponent
     */
    public var hostComponent:VScrollBar;
    
    /**
     *  Skin to use for the thumb Button skin part
     */
    protected var thumbSkinClass:Class;
    
    //--------------------------------------------------------------------------
    //
