>I have a form with a grid based on a cursor. ...
A "calculated field" can be defined in a Grid column. Just set the ControlSource of the column to an expression, like
Field1 + Field2 or whatever you need.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)