@Override
  String getHelpTopic() {
    Configurable configurable = myFilter.myContext.getCurrentConfigurable();
    while (configurable != null) {
      String topic = configurable.getHelpTopic();
      if (topic != null) {
        return topic;
      }
      configurable = myFilter.myContext.getParentConfigurable(configurable);
    }
    return "preferences";
  }
@Override
  String getHelpTopic()