private void _ButtonLitigeNouveau_Click_1(object sender, RoutedEventArgs e)
        {
            LitigeFactureClientWindow litigeWindow = new LitigeFactureClientWindow();
            litigeWindow.DataContext = new Litige_Facture();
            ((Litige_Facture)litigeWindow.DataContext).Facture1 = (Facture)this.DataContext;
            ((Litige_Facture)litigeWindow.DataContext).Date_Litige = DateTime.Today;

            bool? dialogResult = litigeWindow.ShowDialog();

            if (dialogResult.HasValue && dialogResult == true)
            {
                ((Facture)this.DataContext).Litige_Facture.Add((Litige_Facture)litigeWindow.DataContext);
            }
            else
            {
                try
                {
                    ((App)App.Current).mySitaffEntities.Detach((Litige_Facture)litigeWindow.DataContext);
                }
                catch (Exception)
                {
                }
            }

            this._dataGridLitigeFactureClient.Items.Refresh();
        }
        private void _ButtonLitigeModifier_Click_1(object sender, RoutedEventArgs e)
        {
            if (this._dataGridLitigeFactureClient.SelectedItems.Count == 1)
            {
                LitigeFactureClientWindow litigeWindow = new LitigeFactureClientWindow();
                litigeWindow.DataContext = (Litige_Facture)this._dataGridLitigeFactureClient.SelectedItem;

                bool? dialogResult = litigeWindow.ShowDialog();

                if (dialogResult.HasValue && dialogResult == true)
                {
                }
                else
                {
                    //Je récupère les anciennes données de la base sur les modifications effectuées
                    ((App)App.Current).mySitaffEntities.Refresh(System.Data.Objects.RefreshMode.StoreWins, (Litige_Facture)(litigeWindow.DataContext));
                }
            }
            else
            {
                MessageBox.Show("Vous devez sélectionner un litige.", "Attention", MessageBoxButton.OK, MessageBoxImage.Exclamation);
            }
        }