private void btnDeleteRound_Click(object sender, RoutedEventArgs e)
{
if (this.tournament.Rounds.Count == 0) return;
if (PMW.Show(StringTable.MainWindow_DeleteRound, MessageBoxButton.YesNo) != MessageBoxResult.Yes) return;
this.tournament.DeleteLastRound();
if (this.tabRound.Items.Count != 0)
{
(this.tabRound.Items[this.tabRound.Items.Count - 1] as Round).ScoreEnabled = true;
}
}