title: event.keyCode doesn't work for enter key
body: <p>I've read that the enter keycode should be 13.  However when using</p>
  
  <pre><code>trace(event.keyCode);
  </code></pre>
  
  <p>other keys will show up but the enter key does not.  Could it be my computer or something? Using macbook pro keyboard.</p>
  
  <pre><code>stage.addEventListener(KeyboardEvent.KEY_DOWN, entered);
  
  function entered(event:KeyboardEvent):void {
      trace(event.keyCode);
      if (event.keyCode == Keyboard.ENTER){
      //or if (event.keyCode == 13){
          trace("enter button");
      }
  }
  </code></pre>
  
  <p>i.e. I can't get this to trace "enter button"
  Also noticed no code traceable for Ctrl. alt Tab or Backpace</p>