control stage frame from button function

when i press the button

it does the trace but ignore the gotoAndPlay

did i miss anything?

package {   import flash.display.MovieClip;   import flash.events.MouseEvent;   public class Main extends MovieClip   {   public function Main()   {   playgame_btn.addEventListener(MouseEvent.CLICK, playgame);   readme_btn.addEventListener(MouseEvent.CLICK, pressread);   }   function playgame(event:MouseEvent):void   {   trace("PLAY has been clicked.");   gotoAndStop(140);   }   function pressread(event:MouseEvent):void   {   trace("SHOW has been clicked.");   gotoAndStop(140);   }   } }