List l = (List) listener.get(eventId);
List l = (List) listeners.get(eventId);
    public final void removeLowLevelEventListener(LowLevelEventListener gl,                                                  String eventId) {        List l = (List) listener.get(eventId);        if (l != null) {            l.remove(gl);            if (l.size() == 0)                listener.remove(eventId);        }    }