import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentAdapter;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JToggleButton;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JToggleButton;
private JToggleButton down;
public BreadCrumb(final DataNode<T> node) {
this.setLayout(new BorderLayout());
private JToggleButton down;
public BreadCrumb(final DataNode<T> node) {
this.setLayout(new BorderLayout());
down = new JToggleButton(">");
final JPopupMenu popup = new JPopupMenu();
for (final DataNode<T> child : node.getChildren()) {
popup.add(new AbstractAction(child.toString()) {
down = new JToggleButton(">");
final JPopupMenu popup = new JPopupMenu();
for (final DataNode<T> child : node.getChildren()) {
popup.add(new AbstractAction(child.toString()) {