I have further expanded upon my first three articles "Strongly Typed Nested Collections", with a two part article demonstrating how to provide a sorting mechanism for a custom collection class, in both ascending and descending directions. The article also shows how to implement filtering on given properties within a collection.
Part 1 walks you through the creation of all the necessary class files; Person, Persons, Comparer and Enumerations.
Part 2 walks you through the process of creating a user interface that offers this functionality to a user.
The articles can be located on the right hand side of this page under the Article Categories section, entitled: Sorting & Filtering Collections