@Override
  protected JComponent createCenterPanel() {
    final var pane = new JBTabbedPane();
    pane.insertTab(NULLABLE, null, myNullablePanel.getComponent(), "", 0);
    pane.insertTab(NOT_NULL, null, myNotNullPanel.getComponent(), "", 1);
    return pane;
  }
@Override
  protected JComponent createCenterPanel()