Depend how many columns U have in that grid.
Supposed that U have grdValue with 1 column than U have
grdValue
- grcColumn
- grhHeader
- txtTextBox
When U press a button U can say in the Click method of the button
thisform.grdValue.grcColumn.txtTextBox.value=thisform.txtAnyTextBox.value
Hope that helps U
Gretting...