>Jim,
>
>I put together a little test form and it works like it is supposed to. My real form uses a grid based on a pview. The recordsource is set in the init of the form. Will any of this make any difference?

Steve,
PMFJI. Maybe you didn't set controlsource after recordsource assignment (and old destroyed). This should work :

myGrid.Recordsource = '...'
myGrid.myColumn.controlsource = ;
'(myAlias.myField1+myAlias.myField2+myAlias.myField3)'

PS: do not omit parentheses.
Cetin