private void BtnAdd_Click(object sender, RoutedEventArgs e)
        {
            ServiceDeliveryViewModel ServiceDelivery = new ServiceDeliveryViewModel();

            ServiceDelivery.Identifier = Guid.NewGuid();

            ServiceDelivery_AddEdit addEditForm = new ServiceDelivery_AddEdit(ServiceDelivery, true);

            addEditForm.ServiceDeliveryCreatedUpdated += new ServiceDeliveryHandler(SyncData);
            FlyoutHelper.OpenFlyout(this, ((string)Application.Current.FindResource("Podaci_o_kurirskoj_sluzbi")), 95, addEditForm);
        }
        private void BtnEdit_Click(object sender, RoutedEventArgs e)
        {
            if (CurrentServiceDelivery == null)
            {
                MainWindow.WarningMessage = ((string)Application.Current.FindResource("Morate_odabrati_kurirsku_slizbu_za_izmenuUzvičnik"));
                return;
            }

            ServiceDelivery_AddEdit addEditForm = new ServiceDelivery_AddEdit(CurrentServiceDelivery, false);

            addEditForm.ServiceDeliveryCreatedUpdated += new ServiceDeliveryHandler(SyncData);
            FlyoutHelper.OpenFlyout(this, ((string)Application.Current.FindResource("Podaci_o_kurirskoj_sluzbi")), 95, addEditForm);
        }