public function end()
    {
        $content = ob_get_clean();
        switch ($this->type) {
            case 'append' :
                $this->data[$this->name] .= $content;
                break;

            case 'prepend' :
                $this->data[$this->name] = $content . $this->data[$this->name];
                break;

            case 'set' :
                $this->data[$this->name] = $content;
        }
        return '';
    }