/// <summary>
/// Get the item containers of an ItemsControl.
/// </summary>
/// <typeparam name="TContainer">
/// The type of the item containers.
/// </typeparam>
/// <param name="control">The ItemsControl.</param>
/// <returns>The item containers of an ItemsControl.</returns>
private static IEnumerable <TContainer> GetContainersIterator <TContainer>(ItemsControl control)
where TContainer : DependencyObject
{
Debug.Assert(control != null, "control should not be null!");
return(control.GetItemsAndContainers <TContainer>().Select(p => p.Value));
}