static JFrame showConfirmDialogInBottomRightCorner(S question, Runnable action) {
  ret showPackedFrameInBottomRightCorner(
    centerAndSouthWithMargins(jlabel(question),
    hgridWithSpacing(
      jThreadedButton("OK", r {
        disposeWindow(heldInstance(JButton));
        callF(action);
      }),
      jCancelButton("No")
    )));
}