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

        measuredWidth = layoutMeasuredWidth;
        measuredHeight = layoutMeasuredHeight;
    }

    /**
     *  @private 
     */

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