Freeze row in Stingray grid used with VBA

I need your help with Stingray Studio grid used in VBA. I would like to freeze second row of the grid (it contains values of active filter) so it is always
visible even if the user scroll down to next rows. (Like by EB worksheets)

Attached is the test macro, but function CanFreezeGridRows always returns false and call of FreezeGridRows seems to be ignored
in this case

Thanks a lot for help