access Pro? duplicate combo box

Using Access to check for duplicate item else add to list

shouldienter = Combo25.Text

For i = 0 To Combo25.ListCount - 1
If shouldienter = Combo25.List(i) Then
Exit Sub
End If
Next i

Combo25.AddItem shouldienter

The problem is acess does not have function .List()
anyone knows alternative?
Need help guys

Access combos have a Column property, so you can access a particular column and row like this:

VB Code:

Combo25.Column(iColumn, iRow)