@Deprecated
  @Override
  public Component add(Component comp) {
    final int childCount = getComponentCount();
    LOG.assertTrue(childCount >= 1);
    if (childCount > 3) {
      throw new IllegalStateException(String.valueOf(childCount));
    }
    if (childCount == 1) {
      setFirstComponent((JComponent)comp);
    }
    else {
      setSecondComponent((JComponent)comp);
    }
    return comp;
  }
@Deprecated
  @Override
  public Component add(Component comp)