docs: protected void initializeElements() {
  		final BusLine line = getBusLine();
  		if (line != null) {
  			int i = 0;
  			for (final BusItinerary itinerary : line.busItineraries()) {
  				onBusItineraryAdded(itinerary, i);
  				++i;
  			}
  		}
  	}