static void removeFromWindow(Component c) {
  JFrame frame = getFrame(c);
  if (frame == null) ret;
  Container cp = frame.getContentPane(); // This is our BorderLayout
  if (cp != c.getParent()) { print("removeFromWindow fail"); ret; }
  cp.remove(c);
  Container mainC = (Container) cp.getComponents()[0];
  cp.remove(mainC);

  frame.setContentPane(mainC);
  
  // magic combo to actually relayout and repaint
  frame.revalidate();
  frame.repaint();
}