private String helpTopic() {
    String helpTopic = null;
    if (myMainPanel instanceof JTabbedPane) {
      int idx = ((JTabbedPane)myMainPanel).getSelectedIndex();
      if (0 <= idx && idx < myConfigurables.size()) {
        helpTopic = myConfigurables.get(idx).getHelpTopic();
      }
    }
    else {
      helpTopic = myConfigurables.get(0).getHelpTopic();
    }
    return helpTopic;
  }
private String helpTopic()