static JPanel showFormTitled_customArrangement(final F1<L<JComponent>, JPanel> arrange, fS title, fO... _parts) {
  ret swing(func -> JPanel {
    final new Var<JFrame> frame;
    L<JComponent> out = showForm_arrange1(showForm_makeComponents(_parts));
    JPanel panel = callF(arrange, out);
    frame.set(showForm_makeFrame(title, panel));
    ret panel;
  });
}