private void btnAdd_Click(object sender, RoutedEventArgs e)
        {
            TaxAdministrationViewModel TaxAdministration = new TaxAdministrationViewModel();

            TaxAdministration.Identifier = Guid.NewGuid();

            TaxAdministrationAddEdit addEditForm = new TaxAdministrationAddEdit(TaxAdministration, true);

            addEditForm.TaxAdministrationCreatedUpdated += new TaxAdministrationHandler(SyncData);
            FlyoutHelper.OpenFlyout(this, ((string)Application.Current.FindResource("Poreska_Uprava")), 95, addEditForm);
        }
        private void btnEdit_Click(object sender, RoutedEventArgs e)
        {
            if (CurrentTaxAdministration == null)
            {
                MainWindow.WarningMessage = ((string)Application.Current.FindResource("Morate_odabrati_stavku_za_izmenuUzvičnik"));
                return;
            }

            TaxAdministrationAddEdit addEditForm = new TaxAdministrationAddEdit(CurrentTaxAdministration, false);

            addEditForm.TaxAdministrationCreatedUpdated += new TaxAdministrationHandler(SyncData);
            FlyoutHelper.OpenFlyout(this, ((string)Application.Current.FindResource("Poreska_Uprava")), 95, addEditForm);
        }