public function auto(
            array $cellsData, 
            int   $nbColsByRow = null, 
            bool  $container = false, 
            array $classes = [], 
            array $attrs = [], 
            array $containerClasses = [], 
            bool  $fluid = true):string
    {
        $nbColsByRow = $nbColsByRow ?? count($cellsData);
        $src = $this->autoStart($nbColsByRow, $container, $fluid, $containerClasses);
        foreach ($cellsData as $cell) {
            $src .= $this->autoNewCol(1, $classes, $attrs);
            $src .= (string) $cell;
        }
        $src .= $this->autoStop();
        return $src;
    }