/// <summary> /// Invoked when this page is about to be displayed in a Frame. /// </summary> /// <param name="e">Event data that describes how this page was reached. /// This parameter is typically used to configure the page.</param> protected override void OnNavigatedTo(NavigationEventArgs e) { base.OnNavigatedTo(e); //check if navigated to from MainPage or ItemDetails if (CheckLastPage(typeof(MainPage))) { // clear elements ListItems.Clear(); // check if size, weight or weight and change title and mode appropriately string val = e.Parameter as string; Mode = val; switch (val) { case Util.SIZE: title.Text = "Size"; break; case Util.WEIGHT: title.Text = "Weight"; break; case Util.VOLUME: title.Text = "Volume"; break; default: break; } } else if (CheckLastPage(typeof(ItemDetails))) { // add element if not null (meaning cancelled), sort list GenericListItem val = e.Parameter as GenericListItem; if (val != null) { ListItems.Add(val); ListItems.Sort(); } } }