private void _newActivite_Click_1(object sender, RoutedEventArgs e) { ParametreActiviteControl parametreActiviteControl = new ParametreActiviteControl(); Activite activite = parametreActiviteControl.Add(); if (activite != null) { this.Secteur_Activite.Add(activite); this.Secteur_Activite = new ObservableCollection<Activite>(this.Secteur_Activite.OrderBy(civ => civ.Libelle)); } else { } }