MS Access Select List will actually update data

PROBLEM: Select List will change the value if set Control Source on Properties, or it will add a empty selection on the select list.
ANSWER:
1. Don't set anything on Control Source on Select List's properties.
2.

Private Sub Form_Load()
   Me.Combo0.Requery
   Me.Combo0 = Me.Combo0.ItemData(0)
End Sub