// panels are not visible without student
  @Override
  public void addHighlightPanel() {
    if (showXmlContent) {
      super.addHighlightPanel();
      ((HighlightDisplayPanel) get("highlightDisplayPanel")).setReadOnly(true);

    } else {
      add(
          new WebMarkupContainer("highlightBox")
              .add(new WebMarkupContainer("highlightControlPanel"))
              .setVisible(false));
      add(new WebMarkupContainer("highlightDisplayPanel").setVisible(false));
      add(new NoHighlightModal("noHighlightModal"));
    }
  }
 public Object lastReading() {
   return _reading.lastIndexOf(34);
 }