static void addToWindow(Component c, Component toAdd) {
  if (toAdd == null) ret;
  JFrame frame = getFrame(c);
  Container cp = frame.getContentPane();

  new JPanel newCP;
  newCP.setLayout(new BorderLayout);
  newCP.add(BorderLayout.CENTER, cp);
  newCP.add(BorderLayout.SOUTH, toAdd);
  
  frame.setContentPane(newCP);
  
  // magic combo to actually relayout and repaint
  frame.revalidate();
  frame.repaint();
}