@Override
  public void writeExternal(Element element) throws WriteExternalException {
    ((JDOMExternalizable)transparencyChessboardOptions).writeExternal(element);
    if (!fileNameVisible) {
      element.setAttribute("fileNameVisible", "false");
    }
    if (!fileSizeVisible) {
      element.setAttribute("fileSizeVisible", "false");
    }
  }
@Override
  public void writeExternal(Element element)