private void X_O(object sender, RoutedEventArgs e)
{
FirstWindow cross_null = new FirstWindow();
cross_null.Show();
this.Close();
}
private void New_Game(object sender, RoutedEventArgs e)
{
FirstWindow new_game = new FirstWindow();
if (MessageBox.Show("Start new game ?", "Question", MessageBoxButton.YesNo, MessageBoxImage.Warning) == MessageBoxResult.Yes)
{
new_game.Show();
this.Close();
}
}