code: protected void initializeElements() {
  		final BusItinerary itinerary = getBusItinerary();
  		if (itinerary != null) {
  			int i = 0;
  			for (final BusItineraryHalt halt : itinerary.busHalts()) {
  				onBusItineraryHaltAdded(halt, i, null);
  				++i;
  			}
  		}
  	}
docs: Run the initialization of the elements from the current bus itinerary.
  
  <p>This function is invoked by the constructor of BusItineraryLayer
  if its parameter <var>autoUpdate</var> is <code>true</code>, and
  not invoked if this parameter is <code>false</code>.