[AccessD] Combo Box RowCount

I'm debugging a form that has two combos that are used to search the data.
These are supposed to refresh their rowsource following a Filter. The
current filter is "City Like 'Toroonto*'", which returns 278 rows. I want
to verify that the refresh code is working. Is there a simple way to
determine how many rows there are in a combo?

Thanks,
Arthur