protected function _unsetselect()
    {
        unset($this->settings['table']);
        unset($this->settings['query']);
        unset($this->settings['option']);
        unset($this->settings['exclude']);
        unset($this->settings['include']);
        unset($this->settings['order']);
        unset($this->settings['selectedKey']);
        unset($this->settings['selectedValue']);
    }