private void btnAdd_Click(object sender, RoutedEventArgs e)
        {
            CountryViewModel country = new CountryViewModel();

            country.Identifier = Guid.NewGuid();

            CountryAddEdit addEditForm = new CountryAddEdit(country, true);

            addEditForm.CountryCreatedUpdated += new CountryHandler(SyncData);
            FlyoutHelper.OpenFlyout(this, ((string)Application.Current.FindResource("Podaci_o_drzavama")), 95, addEditForm);
        }
        private void btnEdit_Click(object sender, RoutedEventArgs e)
        {
            if (CurrentCountry == null)
            {
                MainWindow.WarningMessage = ((string)Application.Current.FindResource("Morate_odabrati_drzavu_za_izmenuUzvičnik"));
                return;
            }

            CountryAddEdit addEditForm = new CountryAddEdit(CurrentCountry, false);

            addEditForm.CountryCreatedUpdated += new CountryHandler(SyncData);
            FlyoutHelper.OpenFlyout(this, ((string)Application.Current.FindResource("Podaci_o_drzavi")), 95, addEditForm);
        }