>>Robert,
>>
>>Are you trying to allow the user to enter a value in the textbox area of the combobox and if what they typed doesn't already exist in the combobox add it to the combobox choices?
>
>Colin,
>yes - I want to treat the combo like a field.

Robert,

I've done something similar. The combobox is a list of positions and allows the user to add new values. The code below is in the combobox's .Valid method. The combobox's RowSource is Position.Position and the ControlSource is People.Position.

IF NOT SEEK(ALLTRIM(THIS.DisplayValue),"POSITION")
mnadd=MESSAGEBOX("Do you wish to add this position type?",4+32+256,;
ALLTRIM(THIS.DisplayValue)+" not found")
IF mnadd=6
INSERT INTO Position (Position) ;
VALUES (THIS.DisplayValue)
REPLACE People.Position WITH THIS.DisplayValue
THISFORM.rtgPageFrame1.Page1.cmbPosition.Requery
THISFORM.rtgPageFrame1.Page1.Refresh
ELSE
THISFORM.rtgPageFrame1.Page1.cmbPosition.DisplayValue=""
THISFORM.rtgPageFrame1.Page1.cmbPosition.Value=""
THISFORM.rtgPageFrame1.Page1.cmbPosition.SetFocus
ENDIF
ENDIF