>That's what I do !
OK, since you said RecordSource... that one is available only for the Grid, not for the columns.
The ControlSource is available both for the column and for the contained TextBox. However, since this is not the name of a field, you must set the ControlSoruce directly for the Column, and not for the contained TextBox.
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)