Nullable DateTimePicker

The DateTimePicker winform control in .NET v1.1 doesn't accept null value, so I surf and find this replacement:

Nullable DateTimePicker
http://www.codeguru.com/Csharp/Csharp/cs_controls/custom/article.php/c9645/

So far it works fine, in general.
As it's written in C#, I have to compile it to class library for my VB.NET project.