// TODO allow an image or ">", viewer
down = new JToggleButton(">");
final JPopupMenu popup = new JPopupMenu();
// TODO allow an image or ">", viewer
down = new JToggleButton(">");
final JPopupMenu popup = new JPopupMenu();
new SwingWorker<DataNode<T>, Void>() {
@Override
protected DataNode<T> doInBackground() throws Exception {
new SwingWorker<DataNode<T>, Void>() {
@Override
protected DataNode<T> doInBackground() throws Exception {