public function buttonToolbar(array $buttonGroups, array $options = array()) {
        $options += [
            'templateVars' => []
        ];
        return $this->formatTemplate('buttonToolbar', [
            'content' => implode('', $buttonGroups),
            'attrs' => $this->templater()->formatAttributes($options, ['vertical']),
            'templateVars' => $options['templateVars']
        ]);
    }