@Override
  protected JComponent createCenterPanel() {
    JPanel panel = new JPanel(new VerticalFlowLayout());
    ButtonGroup group = new ButtonGroup();
    group.add(myCompact);
    group.add(myCanonical);
    group.add(myCustom);
    panel.add(myCompact);
    panel.add(myCanonical);
    panel.add(myCustom);
    return panel;
  }
@Override
  protected JComponent createCenterPanel()