title: Can't Access MovieClips' Timelines through stage.getChildAt
body: <p>I've simplified my problem down to this self explanatory code. Why doesn't each Movie Clip on the stage go to frame two? The error occurs on line six.</p>
  
  <pre><code>stage.addEventListener(Event.ENTER_FRAME,update);
  function update(e:Event)
  {
      for (var i:int=0; i&lt;stage.numChildren; i++)
      {
          stage.getChildAt(i).gotoAndPlay(2);//error here
      }
  }
  </code></pre>
  
  <p>Thank you for your help.</p>