private void addChamp_Click(object sender, RoutedEventArgs e)
        {
            Champion      champ      = getSelectedChampion();
            ChampionGroup champGroup = getSelectedChampionGroup();

            if (champ == null || champGroup == null || champListBox.Items.Contains(champ))
            {
                return;
            }

            champListBox.Items.Add(champ);
            champGroup.AddChamp(champ);
        }
        private void champList_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
        {
            if (e.Key == System.Windows.Input.Key.Enter)
            {
                Champion      champ      = getSelectedChampion();
                ChampionGroup champGroup = getSelectedChampionGroup();

                if (champ == null || champGroup == null || champListBox.Items.Contains(champ))
                {
                    return;
                }

                champListBox.Items.Add(champ);
                champGroup.AddChamp(champ);
            }
            ;
        }