public void GoTo(CatalogItemModel catalogItem)
        {
            //cancel active requests
            //WebClient.Cancel();
            WebClient.Cancel();

            NavigationStack.Push(CurrentFolder);
            CurrentFolder = new CatalogFolderModel
            {
                Items   = new List <CatalogItemModel>(),
                BaseUrl = catalogItem.OpdsUrl,
                CurrentRepresentationItem = catalogItem
            };
        }