public function addRootAdminBar()
    {
        $identifier = $this->getModel()->getIdentifier();
        $options = $this->getModel()->getPages($identifier);

        add_action('admin_bar_menu', function () use ($identifier, $options) {
            global $wp_admin_bar;

            // Add main admin bar
            $wp_admin_bar->add_node([
                'parent'    => '',
                'id'        => $identifier,
                'title'     => $options['title'],
                'href'      => admin_url('admin.php?page='.$identifier),
                'meta'      => false
            ]);
        });
    }