private void GameOver(object sender, EventArgs e)
{
_timer.Stop();
string winnerMessage = $"The winner is: {_game.Winner.Name}";
LeftInformativeLabel.Content = winnerMessage;
RightInformative_Label.Content = winnerMessage;
// show high scores window
var window = new HighScores(new Summary(_game.Winner.Name, _game.GetCurrentPlayer().Name));
window.Show();
window.Closed += CloseWindow;
// if the highscores window is closed, go back to main menu
}