protected function _setupNavigation($sNode)
    {
        // navigation according to class
        if ($sNode) {
            $myAdminNavig = $this->getNavigation();

            // default tab
            $this->_aViewData['default_edit'] = $myAdminNavig->getActiveTab($sNode, $this->_iDefEdit);

            // buttons
            $this->_aViewData['bottom_buttons'] = $myAdminNavig->getBtn($sNode);
        }
    }