// End of mapping                                      //
 ////////////////////////////////////////////////////////
 private void expandTo(int index) {
   makeComponentVisible();
   JButtonOperator bo =
       new JButtonOperator(
           (JButton)
               getDivider()
                   .waitSubComponent(
                       new JButtonOperator.JButtonFinder(
                           ComponentSearcher.getTrueChooser("JButton")),
                       index));
   bo.copyEnvironment(getDivider());
   bo.setVisualizer(new EmptyVisualizer());
   bo.push();
 }