static ButtonGroup showRadioButtons(L<S> strings) {
  ButtonGroup g = jradiobuttons(strings);
  showFrame(jscroll(vstack(buttonsInGroup(g))));
  ret g;
}

static ButtonGroup showRadioButtons(S title, L<S> strings) {
  ButtonGroup g = showRadioButtons(strings);
  setFrameTitle(title, getFrame(g));
  ret g;
}