protected function isBootstrapGroupUsage($type)
    {
        if( ($this->settings['group']['class'] ?? NULL) || isset($this->callableGroup) )
        {   
            if( ! $this->isCheckboxOrRadio($type) )
            {
                if( ! isset($this->settings['attr']['class']) )
                {
                    $this->settings['attr']['class'] = 'form-control';
                }
                else
                {
                    $this->settings['attr']['class'] .= ' form-control';
                }
            }
        }
    }