private void Back(object sender, RoutedEventArgs e)
        {
            Startowa start = new Startowa();

            this.Close();
            start.Show();
        }
        // button - start


        private void Button_Click(object sender, RoutedEventArgs e)
        {
            // open game panel
            Startowa start = new Startowa();

            this.Close();
            start.Show();
        }