svoid removeAndValidate(Component c) {
  if (c != null) swing {
    Container cc = c.getParent();
    if (cc != null) {
      cc.remove(c);
      cc.revalidate();
      cc.repaint(); // bugs without this
    }
  }
}

svoid removeAndValidate(Container container, Component c) {
  if (c != null) swing {
    if (c.getParent() == container) removeAndValidate(c);
  }
}