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