How to alter a .NET DateTimePicker control to allow enter null values?

Question

What\'s the easiest and most robust way of altering the .NET DateTimePicker control, to allow users to enter null values?

Answer 1

Tri's solution did not quite cut it for me and so thought Mr. Grazioli and he did something about it: http://www.codeguru.com/csharp/csharp/cs_controls/custom/article.php/c9645