I’m not sure I fully understand the issue.
The DSLDate control by design does not have a PV or DBNav property. Out of the box when a user PVs on the field, a calendar control will appear instead of the typical PV list window. And when they select a date (or type in a date) that date is validated to make sure it’s properly formed (i.e… no 13th month or 32nd day allowed, etc…).
If you are looking to instead have a user PV on the date field and be presented with a list of valid dates (maybe a list of 10 valid schedule dates or something) then you would need to use something other than the DSLDate control. A regular text box would work or maybe a combobox.