public void setBezierLabelPosition(Vector2D position) {
   if (link instanceof SLinkBezier) {
     SLinkBezier lb = (SLinkBezier) link;
     lb.setLabelPosition(position);
   }
 }
 public void setBezierControlPoints(Vector2D points[]) {
   if (link instanceof SLinkBezier) {
     SLinkBezier lb = (SLinkBezier) link;
     lb.setControlPoints(points);
   }
 }