I'm working in DVD Studio Pro. A couple of months ago I did create true 16.9 wide screen. And when I played it on a 4.3 monitor, it was letterboxed. Which is fine.

What is that magic button or setting I'm forgetting to achieve this?
This link below is the only place I think I'm supposed to be for this setting.
As you can see, the only choice that comes close is the 16.9 letter boxed setting.

Morelli Media (http://www.morellimedia.com/clientphoto.php?photo=Picture%202.png)

Just some other info. Original footage is true 16.9 from Sony EX-1, and I'm making a standard def DVD. I appreciate any help, thanks.

Aspect ratio 1.1 - square pixels.

It might seem a little counter-intuitive but all you need to do author your video with widescreen SD delivery in mind and a PAR of 1.2. It's the DVD player, knowing whether the connected TV's aspect ratio is 4:3 or 16:9, that will automagically display the correct image. If the user has told the player that the TV is 4:3, the player will letterbox wide screen video without any user intervention.

I don't know how it's done, but my guess is there's a bit on your disk somewhere that tells the player the video is widescreen. Then it handles the display correctly.

Aspect ratio 1.1 - square pixels.

actually square pixels aspect ratio are 1.0