private void bUpdate_Click(object sender, RoutedEventArgs e)
        {
            if (txtName.Text != "" && txtLocation.Text != "")
            {
                bool success = _fService.UpdateAirport(_airport.airportID, txtName.Text, txtLocation.Text);

                if (success)
                {
                    ContentControlSuccess.Content = new DisplaySuccess("Lufthavn er opdateret!");
                    ((MainWindow)Application.Current.MainWindow).TabAirport.LoadGridData();
                }
                else
                {
                    ContentControlSuccess.Content = new DisplayError("FEJL!");
                }
            }
            else
            {
                ContentControlSuccess.Content = new DisplayError("Alle felter skal udfyldes!");
            }
        }