eventReceiver->RemoveEventListener(NS_LITERAL_STRING("create"), this, PR_TRUE);
eventReceiver->RemoveEventListener(NS_LITERAL_STRING("popupshowing"), this, PR_TRUE);
nsMenuListenerAccessible::~nsMenuListenerAccessible(){  if (mRegistered) {     nsCOMPtr<nsIDOMEventReceiver> eventReceiver(do_QueryInterface(mDOMNode));     if (eventReceiver)        eventReceiver->RemoveEventListener(NS_LITERAL_STRING("create"), this, PR_TRUE);     }}