title: embedded button.swf does not fire CLICK event
body: <p>i'm trying to embed a swf to my as3 flex project like this:</p>
  
  <pre><code>[Embed(source = "../assets/next_button.swf")]
  [Bindable]
  protected var nextButtonClass:Class;
  protected var next_btn:MovieClip = next_btn = new nextButtonClass() as MovieClip;
  // ...
  next_btn.addEventListener(MouseEvent.CLICK, onAdChange);
  </code></pre>
  
  <p>next_button.swf is as2 and created with adobe flash cs4. there is a single button inside it.</p>
  
  <p>if i change type of button symbol to movieclip at next_button.fla, there is no problem at passing CLICK event.</p>
  
  <p>i tried to cast next_btn to mx.controls.Button and fl.controls.Button classes, next_btn is becoming null in that case.</p>
  
  <p>by the way button is reacting mouseover and click events properly just doesn't pass it to upper swf.</p>
  
  <p>is there any trick i can do to pass Button events to my container swf?</p>