static JFrame renewFrame(final JFrame frame) {
  ret (JFrame) swing(func {
    JRootPane root = frame.getRootPane();
    JFrame frame2 = new JFrame(frame.getTitle());
    frame2.setBounds(frame.getBounds());
    call(frame, "setRootPane", new JRootPane);
    frame.dispose();
    call(frame2, "setRootPane", root);
    ret frame2;
  });
}