else string = getClass ().getName () + "[" + paramString () + "] on " + source;
  public String toString ()  {    String string = null;    if (source instanceof Component)      string = getClass ().getName () + "[" + paramString () + "] on "        + ((Component) source).getName ();    else if (source instanceof MenuComponent)      string = getClass ().getName () + "[" + paramString () + "] on "        + ((MenuComponent) source).getName ();    return string;  }