code: @Api
  	public final HandlerRegistration addMapModelChangedHandler(final MapModelChangedHandler handler) {
  		return handlerManager.addHandler(MapModelChangedHandler.TYPE, handler);
  	}
docs: Add a handler which listens to all changes in the map model.
  
  @param handler handler
  @return {@link com.google.gwt.event.shared.HandlerRegistration} used to remove the handler
  @since 1.10.0