>I add the Combo to the column and deleting the Text1 object.
>
>VFP actually changes the CurrentControl automatically if the Combo is the only input control in the column.
>

Yes, you right, sorry.

I make similar class, test it and don't get similar problem.
Below the class code

**************************************************
*-- Class: combo_in_grid (c:\vstudio\vfp\combolib.vcx)
*-- ParentClass: form
*-- BaseClass: form
*
DEFINE CLASS combo_in_grid AS form


DoCreate = .T.
Caption = "Form1"
Name = "combo_in_grid"


ADD OBJECT grid1 AS grid WITH ;
ColumnCount = 1, ;
DeleteMark = .F., ;
Height = 161, ;
Left = 20, ;
Panel = 1, ;
RowHeight = 25, ;
Top = 20, ;
Width = 270, ;
Name = "Grid1", ;
Column1.Width = 163, ;
Column1.Sparse = .F., ;
Column1.Name = "Column1"


ADD OBJECT combo_in_grid.grid1.column1.header1 AS header WITH ;
Caption = "Header1", ;
Name = "Header1"


ADD OBJECT combo_in_grid.grid1.column1.combo1 AS combobox WITH ;
BoundColumn = 2, ;
ColumnWidths = "50,0", ;
RowSourceType = 6, ;
RowSource = "itty.cname,iid", ;
ControlSource = "invm.ittyid", ;
Height = 24, ;
ColumnLines = .F., ;
Left = 59, ;
Top = 29, ;
Width = 100, ;
BoundTo = .T., ;
Name = "Combo1"


ENDDEFINE
*
*-- EndDefine: combo_in_grid
**************************************************

I'm in curious.