popupMenu = new JPopupMenu();
popupMenu.setLabel("");
addPopup(tree, popupMenu);
AbstractBrowserActionItem actionRefresh = new RefreshAction();
actionRefresh.getMenuItem().setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F5, 0));
actionRefresh.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
triggerNodeAction(RefreshAction.ID);
}
});