valueChanged();
public Port(VDBPort data, ContainerObject parent, int x, int y) {	super(parent);	this.data = data;	setColor(Constants.FRAME_COLOR);		setWidth(Constants.LINK_STUB_SIZE);	setHeight(Constants.LINK_STUB_SIZE);	setX(x); setY(y);		properties = new LinkProperties(data);			data.setVisibleObject(this);		// initialize polygon so that it contains 5 points	int[] pts = new int[5];	leftPoly = new Polygon(pts, pts, 5);	rightPoly = new Polygon(pts, pts, 5);}