According to Microsoft KB Q138095 it is possible
to have a checkbox in a grid column that is
bound to an array (array index is Recno()).

This worked well in VFP3 and VFP5. With VFP6 (SP2)
it stopped working: The checkbox cannot be changed by
clicking. A change by program code is still possible.
It doesn't matter whether the record source is a cursor,
table or SQL statement.

Andreas