private void Button_Click(object sender, RoutedEventArgs e)
{
FenetreRendezVous fn = new FenetreRendezVous(r1);
fn.Show();
this.Close();
}
private void ConnexionButton_Click(object sender, RoutedEventArgs e)
{
FenetreRendezVous fenetre = new FenetreRendezVous(null);
fenetre.Show();
}