I have an SSTab control on my form with several tabs. I would like to disable the switching of tabs while a certain condition is true.

I have tried several things, none of which work correctly.

This worked fine on my laptop:

Code:
Private Sub tabMainForm_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
    If editMode > 0 Then
         MsgBox "Please finish entering information. Click Save or Cancel."
    End If
'End Sub
But not on my PC, which I thought was strange.

Any ideas?