  *  @eventType spark.events.TrackBaseEvent
  *  
  *  @langversion 3.0
- *  @playerversion Flash 9
- *  @playerversion AIR 1.1
- *  @productversion Flex 3
+ *  @playerversion Flash 10
+ *  @playerversion AIR 1.5
+ *  @productversion Flex 4
  */
 [Event(name="thumbDrag", type="spark.events.TrackBaseEvent")]
 

    //
    //--------------------------------------------------------------------------

	private var mouseDownTarget:DisplayObject;

    //--------------------------------------------------------------------------
    //

     */ 
    private function stage_mouseWheelHandler(event:MouseEvent):void
    {
        if (event.target != stage)
            return;

        system_mouseWheelHandler(event);
