this.addDisplayTransformListener(new DisplayTransformListener() { public void displayTransformed(DisplayTransformEvent e) { System.out.println("Display Event: " + e.getEventType()); } });  }
}
	public RenderBox(NController ctl) {		// (1) convert NV2D graph to a data structure usable by Prefuse		// (2) create a new item registry		//  the item registry stores all the visual		//  representations of different graph elements		super(new ItemRegistry(new DefaultGraph(true)));				// establish settings controller		_settings = new RenderSettings();		// _pFactory = PopupFactory.getSharedInstance();				_ctl = ctl;				// setup the popup menu for vertices		_vertexMenu = new PopupMenu();		_lastItemClicked = null;				_director = new ActivityDirector();		_controls = new ControlManager(this);				// create a new display component to show the data		// setSize(400,400);		// pan(350, 350);		// Set Mouse Adaptor and Drag ALWAYS ON		_controls.addControl(CTL_MOUSE_ADAPTOR, new MouseAdapter(this));		_controls.addControl(CTL_DRAG_CONTROL, new DragControl());		setViewMode(VIEW_MODE_PAN_ZOOM);				_empty = true;		initialize(null);						// TODO - EXAMPLE Listener		this.addDisplayTransformListener(new DisplayTransformListener() {		    public void displayTransformed(DisplayTransformEvent e) {		        System.out.println("Display Event: " + e.getEventType());		    }		});				}