title: AS3 - Uses of addEventListener arguments
body: <p>Now I am working on Flex 4 with AS3. In most of time I am using the <strong>addEventListener</strong>. 
       This listener default arguments are <em>type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false</em>. But most of the developers doesn't consider the last 3 arguments. But I want to know the uses of these 3 arguments?</p>
  
  <p>Anyone call tell me answer?</p>