private void about_button_Click(object sender, RoutedEventArgs e)
        {
            foreach (System.Windows.Controls.RadioButton rb in radioButtons)
            {
                rb.IsChecked = false;
            }
            about f2 = new about();

            f2.ShowDialog();
        }
        private void about_button_Click(object sender, RoutedEventArgs e)
        {
            about f2 = new about();

            f2.ShowDialog();
        }