@Override
public void keyReleased(final KeyEvent event) {
// check if menu item has key event for pure keyboard usage
TreePath[] selectedPaths = mTree.getSelectionPaths();
ContextMenu menu = createContextMenu(selectedPaths);
for (MenuElement element : menu.getPopupMenu().getSubElements()) {
if (element instanceof JMenuItem) {
final JMenuItem item = (JMenuItem) element;
final Action action = item.getAction();
if (action != null) {
Object keyboard = action