Hi Luis,

Increment the ColumnCount of your grid. You can refer to the new column by:

LOCAL lnCount
WITH thisform.grdMyGrid
   lnCount = .ColumnCount + 1
   .ColumnCount = lnCount
   .Columns(lnCount).AddObject('MyCheckBox', 'CheckBox')
   .Columns(lnCount).MyCheckBox.Visible = .T.
   .Columns(lnCount).RemoveObject('Text1')
   .Columns(lnCount).ControlSource = "YourTable.Field"
ENDWITH

>I've got a grid in a form and on the fly I want to create a checkbox control in a grid column.
>Thanks in advance, Luis.