private void back_Click(object sender, RoutedEventArgs e)
{
Expermode1 exper1 = new Expermode1();
App.Current.MainWindow = exper1;
exper1.Show();
this.Close();
}
private void exper_Click(object sender, RoutedEventArgs e)
{
Expermode1 window2 = new Expermode1();
App.Current.MainWindow = window2;
window2.Show();
this.Close();
}