Thanks Aleksey,

Aerror indeed shows that there are uncommited changes in the grid alias. When I took a closer look, it appears that Common Controls library by Alexander Grigorjev (downloaded from UT, no source) changes the status of the controlsource field the datetimepicker is bound. Because there aren't actually any changes done at this point, I just have to run TABLEUPDATE(.T.,.T.) after DATETIMEPICKER is initialized itself, I think.

AT