[flexcoders] need memory leakage clarification

[hworke]

   Hello devs,

   I understand that if an UI component has an added
   event listener and even if it is removed from its
   parent - the memory held by the component will not
   be released. Now the question is if I have a button
   declared in mxml like this
   
     <mx:Button id="testBtn" click="handleClick()"/>

   In this case do I need to remove the click event
   listener like this -    
     testBtn.removeEventListener(MouseEvent.CLICK,handleClick);

   or just removing the button from the parent will
   take care of this?