Encore\Admin\Widgets\Tab::dropDown PHP Method

    public function dropDown(array $links)
    {
        if (is_array($links[0])) {
            foreach ($links as $link) {
                call_user_func([$this, 'dropDown'], $link);
            }
            return $this;
        }
        $this->attributes['dropDown'][] = ['name' => $links[0], 'href' => $links[1]];
        return $this;
    }