allowed.add(PositionType.NEXT);
if (this.startComponent.getPrevious() == null && !(this.startComponent instanceof Nozzle))
allowed.add(PositionType.PREVIOUS);
allowed.add(PositionType.NEXT);
if (this.startComponent.getPrevious() == null && !(this.startComponent instanceof Nozzle))
allowed.add(PositionType.PREVIOUS);