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);

  }

  }

}