code: @SuppressWarnings({ "unchecked", "rawtypes" })
  	protected void registerLayerListener() {
  		Dictionary dict = new Properties();
  		dict.put("name", getName()); //$NON-NLS-1$
  		registrations.add(getPlatformServices().registerService(
  				ILayerListener.class.getName(), new AggregatorLayerListener(this), dict));
  	}
docs: Registers the layer listener