static JInternalFrame showForm_makeInternalFrame(JDesktopPane desktop, S title, JPanel panel) {
  JInternalFrame f = addInternalFrame(desktop, title, withMargin(panel));
  minInternalFrameWidth(f, 400);
  packInternalFrameVertically(f);
  centerInternalFrame(f);
  // TODO: handleEscapeKey(f);
  ret f;
}