/// <summary>
/// Checks if hierarchy item is equal to reference item or its child (disregarding of level).
/// </summary>
/// <param name="source"> Source item. </param>
/// <param name="reference"> Reference item. </param>
/// <returns> Value indicates if source is equal to reference or reference is child of source. </returns>
public static bool IsEqualOrChildOf(this IHierarchy source, IHierarchy reference)
{
return(source.Equals(reference) || reference.Children.Any(source.IsEqualOrChildOf));
}