docs: public void removeAllBusLines() {
  		for (final BusLine busline : this.busLines) {
  			busline.setContainer(null);
  			busline.setEventFirable(true);
  		}
  		this.busLines.clear();
  		fireShapeChanged(new BusChangeEvent(this,
  				BusChangeEventType.ALL_LINES_REMOVED,
  				null,
  				-1,
  				"shape", //$NON-NLS-1$
  				null,
  				null));
  		checkPrimitiveValidity();
  	}