Proshow Gold - aspect ratio

[filipdebie]

I want to make a slideshow DVD to watch on my widescreen TV set.
I have Photodex Proshow Gold to do that but I don't know where to set the right aspect ratio in this application: there are 3 possiblities:
1. slide options- object settings -aspect : auto / square pixels / 4:3 / 16:9/ custom
2. Show options - aspect ratio : 4:3(TV) / 16:9(widescreen) / custom
3. create video file - display - aspect ratio : square pixels / 4:3(TV) / 16:9(widescreen)

So there are 3 places where I can choose the 16:9 settings
What settings should I use starting from 4/3 images and from 16/9 images

[masterpug]

show options, that's it. from top menu at any time. widescreen tv playback is fantastic with a WS slideshow from proshow gold...enjoy!