public function group($code = '', String $class = '')
    {
        if( is_string($code) )
        {
            $this->settings['group']['class'] = $this->bootstrapClassResolution('form-group', $code);

            return $this;
        }
        elseif( is_callable($code) )
        {
            $this->callableGroup = true;

            $result = $this->getHTMLClass()
                           ->class('form-group row' . Base::prefix($class, ' '))
                           ->div(EOL . Buffering\Callback::do($code));

            unset($this->callableGroup);
            
            return $result;
        }
    }