List l = (List) listener.get(eventId);
List l = (List) listeners.get(eventId);
    public final void addLowLevelEventListener(LowLevelEventListener gl,                                               String eventId) {        List l = (List) listener.get(eventId);        if (l == null) {            l = new ArrayList(2);            l.add(gl);            listener.put(eventId, l);        } else if (!l.contains(gl))            l.add(gl);    }