Values in Combo Box after adding to original Validation List

[Dale]

Hello,

I have a Validation List which I used to create a Combo Box based on
http://www.contextures.com/xlDataVal14.html.

The original Validation List was about 2700 rows. I now have 150
additional rows to add and I expect this to grow over time.

My Combo Box ListFillRange in Properties is $I$6:$i$2712.

I have tried to change the Combo Box properties to extend the original
Validation List but this seems to only do it for one Combo Box in one
cell. How can I change the Combo Box properties so all cells with
Combo Boxes pick up the whole Validation List?

It seems like I should be to change the LinkedCell reference in the
existing VBA code in this section but it isn't working yet:
If cboTemp.Visible = True Then
With cboTemp
.Top = 10
.Left = 10
.ListFillRange = ""
.LinkedCell = "$i$6:$i$5000"
.Visible = False
.Value = ""
End With
End If

Any ideas how to update the Combo Box so it display all additions to
the original Validation List?

Thanks,
Dale