private void ButtonAdd_Click(object sender, RoutedEventArgs e)
        {
            CWheel     newitem = new CWheel("", 1590);
            TireEditor geditor = new TireEditor(this.Title, newitem);

            if (geditor.ShowDialog() != true)
            {
                return;
            }
            data.wheelList.Add(newitem);
            ButtonSave.IsEnabled = true;
            LoadData();
        }
        private void ButtonModify_Click(object sender, RoutedEventArgs e)
        {
            if (listBox1.SelectedIndex == -1)
            {
                return;
            }
            TireEditor editor = new TireEditor(this.Title, (CWheel)listBox1.SelectedItem);

            if (editor.ShowDialog() == true)
            {
                ButtonSave.IsEnabled = true;
            }
            listBox1.Items.Refresh();
        }