private void lvCars_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            AddEditCar aec = new AddEditCar(this);

            aec.ShowDialog();
            RefreshList();
        }
        private void miAddCar_Click(object sender, RoutedEventArgs e)
        {
            AddEditCar aec = new AddEditCar(this);

            aec.ShowDialog();
            RefreshList();
        }