docs: public void removeCmsEventListener(I_CmsEventListener listener) {
  
          synchronized (m_eventListeners) {
              Iterator<Integer> it = m_eventListeners.keySet().iterator();
              while (it.hasNext()) {
                  List<I_CmsEventListener> listeners = m_eventListeners.get(it.next());
                  listeners.remove(listener);
              }
          }
      }