private function getItems(NavContainer $container, $parentNavId = 0, $parentGroup = [], $index = 1)
    {
        $navs = $container->getNavs()->andWhere(['parent_nav_id' => $parentNavId])->all();

        foreach ($navs as $nav) {
            $array = $nav->toArray();

            if (empty($nav->activeLanguageItem)) {
                continue;
            }
            $array['title'] = $nav->activeLanguageItem->title;

            foreach ($this->getGroups() as $key => $group) {
                $isInheritedFromParent = false;

                if (isset($parentGroup[$key])) {
                    if ($parentGroup[$key]['isGroupPermissionInheritNode'] || $parentGroup[$key]['isInheritedFromParent']) {
                        $isInheritedFromParent = true;
                    }
                }

                $array['groups'][$key] = [
                    'id' => $group->id,
                    'isGroupPermissionInheritNode' => $nav->isGroupPermissionInheritNode($group),
                    'hasGroupPermission' => $nav->hasGroupPermission($group),
                    'isInheritedFromParent' => $isInheritedFromParent,
                    'permissionCheckbox' => $nav->hasGroupPermissionSelected($group),
                    'groupFullPermission' => $this->groupHasFullPermission($group),
                ];
            }

            $array['nav_level'] = $index;

            self::$_permissionItemData[$container->id][] = $array;

            $this->getItems($container, $nav->id, $array['groups'], $index+1);
        }
    }