TwwDBGrid and filling null values with 'n/a'

Hi,

I am displaying the result of an outer join, read-only, in a TwwDBGrid, and all is well. But there are quite a lot of cells showing null values, and the users want to see helpful text such as 'n/a' or 'no result' instead of a blank.

Ideally, something like the OnAfterDrawCell event would allow me to show some text other than the actual content of the field, but TwwCustomDrawGridCellInfo doesn't offer a Text property.

Am I missing an obvious way to do this?