I got another problem.

In flex I can only reference the flash button by its ID property.

Most of the time I can't know its ID. I need cover it to a super class like MovieClip Instead of that.

How can I fix this ?

 

 <mx:Script>
  <![CDATA[
   private function clickHandler(event:MouseEvent):void
   {

      /* not work */
    MovieClip(event.target).gotoAndPlay(MovieClip(event.target).currentLabel);

     /* only this way can run */

    query.gotoAndPlay(query.currentLabel);
   }
  ]]>
 </mx:Script>
 <local:intergratedQueryButton id="query" click="clickHandler(event)" x="305" y="500"/>