/// <summary>
/// Find the type in this set of types which is the least number of
/// inheritance levels above the specified type.
/// </summary>
/// <param name="forType">The type to seach for</param>
/// <returns>The type in this collection that is closest in the inheritance
/// hierarchy to the specified type. Or, null if the type does not have an
/// ancestor in the collection.</returns>
public Type ClosestAncestor(Type forType)
{
return(TypeExtensions.ClosestAncestor(Items, forType));
}