Inputbox-Cancel not working

MSDN states than when you press cancel buttong in an inputbox it returns "" and yet I get the inputbox's value. Anyone has any idea why this happens? how can i find out if user pressed cancel?

VB Code:

Private Sub Command1_Click()
Dim s As String
 
    s = InputBox("Testing")
    
    If StrPtr(s) = 0 Then
        MsgBox "User pressed cancel"
    Else
        MsgBox s
    End If
    
End Sub

hehe, works like a charm :)

Thanks