title: How to Fake a AsyncToken return in ActionScript 3
body: <p>Using Parsley,
  I have a service that I access through a
  [Command(selector='list')]
  public function getRssFeed( msg:RssEvent ):AsyncToken
  {
  return service.list() as AsyncToken;
  }</p>
  
  <p>when I point to the "Real" RssService, everything works as expected. My problem is when I point to the "Mock" RssService. I can't figure out how to fake a AsyncToken with some dummy data return... does anyone knows how to do this ?</p>