private void Button_Click(object sender, RoutedEventArgs e)
{
Start_Menu start = new Start_Menu();
start.Show();
this.Visibility = Visibility.Hidden;
this.Close();
}
private void Button_Click(object sender, RoutedEventArgs e)//Start menu
{
Start_Menu start = new Start_Menu();
start.Show();
this.Visibility = Visibility.Hidden;//https://stackoverflow.com/questions/33823326/this-close-doesnt-work-in-window-wpf/33823397
this.Close();
}