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  protected void updateAjaxAttributes(AjaxRequestAttributes attributes)
  {
      super.updateAjaxAttributes(attributes);

      AjaxCallListener myAjaxCallListener = new AjaxCallListener() {

          @Override 
          public CharSequence getBeforeHandler(Component component) { 
              return "alert('I\'m executed before the firing of the Ajax call')"; 
          }
      };
      attributes.getAjaxCallListeners().add(myAjaxCallListener);
  }