ComboBox.additem, error?

[Stomach Pulser]

I am using code such as the following (all variables and such are declared)

Code:

frmBla.cmbBlarghh.AddItem(Index & ": " & bala & " " & bala2)

and I get no error. However, when I add the optional index,

Code:

frmBla.cmbBlarghh.AddItem(Index & ": " & bala & " " & bala2, index)

I get an error (in design-time, not run-time)...

Code:

Compile error:
Expected: =

I have no clue why it does this, any help?