I'm looking for a way to add an EventListener which will automatically removes itself after the first time it fires, but I can't figure a way of doing this the way I want to.

I found this function (here) :

public class EventUtil
{
    public static function addOnceEventListener(dispatcher:IEventDispatcher,eventType:String,listener:Function):void
    {
         var f:Function = function(e:Event):void
         {
              dispatcher.removeEventListener(eventType,f);
              listener(e);
          }
          dispatcher.addEventListener(eventType,f);
    }
}

But instead of having to write :

EventUtil.addOnceEventListener( dispatcher, eventType, listener );

I would like to use it the usual way :

dispatcher.addOnceEventListener( eventType, listener );

Has anybody got an idea of how this could be done?
Any help would be greatly apprecitated.