Private Sub UserForm_QueryClose(Cancel As Integer, CloseMode As Integer)
Dim Reponse As Byte
If CloseMode = vbFormControlMenu Then
Reponse = MsgBox("Etes-vous sûr de vouloir quitter?", vbYesNo + vbQuestion, "Quitter")
If Reponse = vbYes Then
Unload Me
Else
Cancel = True
End If
End If
End Sub