I'm not sure what the DTPicker OCX is but I if it represents DateTimePicker, I just use the Calender ActiveX control in the form and design my own time selection listboxes.
I'm guessing if you do find it, you'll most likely need to register it. Some of these are free, others are not. If it's an OCX control not included with MSAccess and you're on a network, you may want to re-consider using this. They are often a hassle in code on network systems and/or multiple users.
Expert Database Programming
MSAccess since 1.0, SQL Server since 6.5, Visual Basic (5.0, 6.0)