/**
  * @param v
  * @param location
  * @see edu.uci.ics.jung.algorithms.layout.Layout#setLocation(java.lang.Object,
  *     java.awt.geom.Point2D)
  */
 @Override
 public void setLocation(V v, Point2D location) {
   super.setLocation(v, location);
   fireStateChanged();
 }