protected function _addUsedPrivileges(array &$privileges, $label)
    {
        foreach ($this->_subItems as $item) {
            // Skip autofilter action, but include all others
            if ($item->get('action') == 'autofilter') {
                continue;
            }
            $_itemlabel = $label . ($item->get('label') ?: $item->get('privilege'));
            if ($_privilege = $item->get('privilege')) {

                if (isset($privileges[$_privilege])) {
                    $privileges[$_privilege] .= "<br/>&nbsp; + " . $_itemlabel;
                } else {
                    $privileges[$_privilege] = $_itemlabel;
                }
            }
            $item->_addUsedPrivileges($privileges, $_itemlabel . '-&gt;');
        }
    }