Using AdvStringGrid NarrowDown with OnGetDisplText

Hi,
is it possible to use the NarrowDown functionality on a grid that is using OnGetDisplText do display it's content? (I do not put any value directly in the cells).

When I try, as soon as a call NarrowDown for a specific value, all rows disappear.

Thanks

Sorry, it performs this NarrowDown on the actual cell values only.