When do you need to do the checking? When the option button is clicked? Or later (like a command button being clicked?).....
VB Code:
Private Sub optLookup_Click(Index as Integer)
Select Case Index
Case 0
'Do something here
Case Else
'Do that other thing
End Select
End Sub
... or ...
VB Code:
Private mintLookup As Integer
Private Sub optLookup_Click(Index as Integer)
mintLookup = Index
End Sub
Private Sub cmdDoSomething_Click()
Select Case mintLookup
Case 0
'Do something here
Case Else
'Do that other thing
End Select
End Sub