if (tab != null) {
Frame frame = tab.getFrame();
if (frame instanceof NavigableActorGraphFrame) {
NavigableActorGraphFrame navFrame = (NavigableActorGraphFrame) frame;
NavigationPTree aTree = navFrame.getTree();
Nameable effigy = tab.getContainer();
if (effigy instanceof NavigableEffigy) {
NavigableEffigy navEff = (NavigableEffigy) effigy;