private function buildHead($title, $disposable = false)
    {
        // Build Head Element
        $head = $this->getHTMLDocument()->getHTMLFactory()->buildHtmlElement('div', $title, '', 'ui-notification-head');
        $this->append($head);

        // Populate the close button
        if ($disposable) {
            $closeBtn = $this->getHTMLDocument()->getHTMLFactory()->buildHtmlElement('span', '', '', 'button-close');
            $head->append($closeBtn);
        }

        return $this;
    }