void welch(object sender, RoutedEventArgs e)
 {
     WINDOW = new WelchWindow();
     if (ORIGINAL == null)
     {
         return;
     }
     CreateWindow();
 }
 void hanning(object sender, RoutedEventArgs e)
 {
     WINDOW = new HanningWindow();
     if (ORIGINAL == null)
     {
         return;
     }
     CreateWindow();
 }
 void triangle(object sender, RoutedEventArgs e)
 {
     WINDOW = new TriangleWindow();
     if (ORIGINAL == null)
     {
         return;
     }
     CreateWindow();
 }