/// <summary>
/// Returns all descendants of PageData type for provided page and level deep.
/// </summary>
/// <param name="pageData">The page for which to find descendants.</param>
/// <param name="levels">Level of how deep to look for descendants in page hiararchy.</param>
/// <returns>Returns sequence of PageData of descendants for provided page.</returns>
public static IEnumerable <PageData> GetDescendants(this PageData pageData, int levels)
{
return(pageData.GetDescendants <PageData>(levels));
}