AppStore.AppDetailsPage.GridScreenshots_ContainerContentChanging C# (CSharp) Method

        private void GridScreenshots_ContainerContentChanging(ListViewBase sender, ContainerContentChangingEventArgs args)
        {
            args.Handled = true;
            if (args.Phase != 0)
            {
                throw new Exception("Not in phase 0.");
            }
            StackPanel templateRoot = (StackPanel)args.ItemContainer.ContentTemplateRoot;
            Image appIcon = (Image)templateRoot.FindName("appScreenshots");
            appIcon.Opacity = 0;
            args.RegisterUpdateCallback(ShowImages);
        }