Charlie,
You can either bind the column or the textbox but not both. The column has a Bound property, if it is .T. then you cannot set the ControlSource for the control, if it is .F. you can set the control's ControlSource. With Bound .T. you use the Column's ControlSource property for data binding and with Bound .F. you use Column.ControlName.ControlSource for data binding.