private JPanel createChooserPanel() {
    JPanel panel = new JPanel();
    panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
    panel.add(myChooser);
    JPanel buttons = new JPanel();
    JButton all = new JButton(LangBundle.message("label.all"));
    all.addActionListener(__ -> myChooser.setAllElementsMarked(true));
    buttons.add(all);
    JButton none = new JButton(LangBundle.message("label.none"));
    none.addActionListener(__ -> myChooser.setAllElementsMarked(false));
    buttons.add(none);
    JButton invert = new JButton(LangBundle.message("label.invert"));
    invert.addActionListener(__ -> myChooser.invertSelection());
    buttons.add(invert);
    panel.add(buttons);
    return panel;
  }
private JPanel createChooserPanel()