Private Sub CommandButton1_Click()
If TextBox1 = "" Or TextBox2 = "" Then MsgBox "clic sur un véhicule, case vide !": Exit Sub
If MsgBox("Voulez-vous valider la date de retour ?", vbYesNo) = vbYes Then
With Sheets("Location")
modif = ListBox1.ListIndex + 2
Cells(modif, 7) = TextBox3.Value
End With
End If
Unload Me
End Sub