title: as3 gotoandplay frame on child movie clip
body: <p>simple one here surely..</p>
  
  <pre><code>mybutton.addEventListener(MouseEvent.MOUSE_DOWN, thefunction);
  
  function thefunction(event:MouseEvent):void {
      gotoAndPlay(** frame on child movie clip **);
  }
  </code></pre>
  
  <p>How do I target the frame ?</p>