How to make ajax link in TbButtonGroup (YiiBooster)?

Question

Yii

When creating a list via TbButtonGroup, ajax request does not work. It just refreshes the page and displays the response (no styling, styling, etc.), while with TbButton everything works fine. Here is the code:

$this->widget('bootstrap.widgets.TbButtonGroup', array(
            'size' => 'small',
            'buttons' => array(
              array(
                'label' => 'Действия',
                'visible'=>Yii::app()->getModule('user')->isAdmin(),
                'items' => array(
                array(
                'label'=>'Удалить',
                'buttonType' => 'button',
                'type'=>'warning',
                'url'=> Yii::app()->createUrl('Posts/Delete', array("id"=>$model->post_id)),
                'size'=> 'small',
               'htmlOptions'=>array(
                        'data-toggle'=>'modal',
                        'data-target'=>'#DeleteModal',
                        'style'=>"margin-top:10px;margin-left:35px;",
                    )),
                array(
                'label'=>'передать ВК',
                'buttonType' => 'ajaxButton',
                'type'=>'default',
                'size'=> 'small',
                'url' => Yii::app()->createUrl('posts/SendVK'),
                'ajaxOptions' => array(
                  'type'     => 'POST',
                  'success' => 'function(data)
                    {
                      var obj = $.parseJSON(data);
                      if (obj == null)
                      {
                        MessageBox.messageDelay("Произошла ошибка", "error");
                      }
                      else
                      {
                        MessageBox.messageDelay("Успешно", "success");
                      }
                    }',
                  'data' => array('post_id' => $model->post_id),
                  ),
               'htmlOptions'=>array(
                        'style'=>"margin-top:10px;margin-left:35px;",
                        )
                    ),
          ),
))));

Also, when using this widget, it is not possible to call the modal window.
Maybe someone faced similar problems?