protected function getDefaultOptionsValues()
    {
        return array(
            'data_class'       => $this->mediaClass,
            'delete_button' => false,
            'enable_delete_button' => false,
            'group_enabled'    => true,
            'group_render'     => $this->groupRender,
            'sub_group_render' => $this->subGroupRender
        );
    }