protected INavigation GetHierarchyRecursive(PageData parent, PageData currentPage, INavigation nav)
        {
            var children =
                _contentLoader.GetChildren<PageData>(parent.PageLink).FilterForVisitor().FilterVisibleInMenu();

            var currentPageAncestors = _contentLoader.GetAncestors(currentPage.ContentLink).Reverse();
            var subNavItems = nav.Items.ToList();

            try
            {
                subNavItems.AddRange(children.Select(child => new NavigationItem
                {
                    Active = (child.PageGuid == currentPage.PageGuid),
                    ActiveTrail = (currentPageAncestors.Any(x =>
                    {
                        var pageData = x as PageData;
                        return pageData != null && pageData.PageGuid == child.PageGuid;
                    })),
                    Children = GetHierarchyRecursive(child, currentPage),
                    CssCls = "",
                    Enabled = true,
                    Title = child.PageName,
                    Reference = child,
                    IsDropDown = false,
                    Href = child.LinkURL
                }));
            }
            catch (NullReferenceException e)
            {
                _logManager.Info("Error in menu generation {0}", e.Message);
            }

            nav.Items = subNavItems;

            return nav;
        }