final Visualization vis = new Visualization();
VisualGraph vg = vis.addGraph(graph, g);
vis.setValue(edges, null, VisualItem.INTERACTIVE, Boolean.FALSE);
TupleSet focusGroup = vis.getGroup(Visualization.FOCUS_ITEMS);
focusGroup.addTupleSetListener(new TupleSetListener() {
public void tupleSetChanged(TupleSet ts, Tuple[] add, Tuple[] rem)
{
for ( int i=0; i<rem.length; ++i )
((VisualItem)rem[i]).setFixed(false);
for ( int i=0; i<add.length; ++i ) {