// GUITreeComponent interface
  @Override
  public void startSetup(Attributes atts) {
    super.startSetup(atts);

    setEnabled(false);

    addActionListener(this);
    Outliner.documents.addDocumentRepositoryListener(this);
  }
 // GUITreeComponent interface
 public void startSetup(Attributes atts) {
   super.startSetup(atts);
   addActionListener(this);
 }