Hi Mantis,
we are working on a nullable DateTime column. We have simple implementation of DateTimePicker that supports null values and allows the column to accept null values.
If you are agree to be a beta tester, we will provide you with an assembly including the nullable DateTime column. You only have to test it and report any bugs found or request features you miss. In case you are interesting, please send us your e-mail at support[at]completit[dot]com.
Thanks in advance.
Sincerely yours,
Support Team