«ChooseUsingDatePicker(DateOfBirth)»
will cause a date picker control to be used when the DateOfBirth data element is required to be captured.
Like other Choose commands, the ChooseUsingDatePicker command will only be included in the interview if the data element referred to is used elsewhere in the template, either directly to cause its value to be inserted into the merged document, or is it is used in an If, When, SetV or other such command or function.
Note that this feature is available only in Version 4 and later of XpressDox.