private function renderCloneColumn()
    {

        $options = ['class' => 'list-cell__button'];
        $layoutConfig = array_merge([
            'buttonCloneClass' => $this->isBootstrapTheme() ? 'col-sm-offset-0 col-sm-1' : '',
        ], $this->layoutConfig);
        Html::addCssClass($options, $layoutConfig['buttonCloneClass']);

        return Html::tag('div', $this->renderCloneButton(), $options);
    }