/// <summary>
/// Enumerates an <see cref="ILogical"/> and its descendants in the logical tree.
/// </summary>
/// <param name="logical">The logical.</param>
/// <returns>The logical and its ancestors.</returns>
public static IEnumerable <ILogical> GetSelfAndLogicalDescendants(this ILogical logical)
{
yield return(logical);
foreach (var descendent in logical.GetLogicalDescendants())
{
yield return(descendent);
}
}