private void ButtonStartNextRoundManual_OnClick(object sender, RoutedEventArgs e) { StartNextRound(true); var pairingWindow = new ManualParingWindow(ivDraft.Rounds.Last()); var result = pairingWindow.ShowDialog(); if (result.HasValue && result.Value) { ivDraft.ConfirmManualPairing(); } else { buttonStartNextRound.IsEnabled = true; buttonStartNextRoundManual.IsEnabled = true; ivDraft.CancelManualPairing(); } }