How do I switch focus in The Lost Vikings on Genesis?

I'm playing 3-player Lost Vikings on Genesis. I read online that, in the SNES version, you can "give" the camera to somebody else by pressing L+R. I tried X+Z (both switch-player buttons) but it doesn't seem to work. Am I missing something?

To switch Vikings on the Genesis:

3 button controller:

Start + D-Pad Left or Right

6 button controller:

X or Z

I personally have always had the three button controllers. I found this article for assistance on the controls for The Lost Vikings on Genesis.

On an unrelated note, this is one of the best childhood memories for me.

Edit: I was misunderstanding that you were doing the three player extension. In this case to switch between players you have to use:

A + B + C

This will cause undesired actions to happen, I don't know if this was overlooked when the game was published for the Genesis or not.

More on this information can be found on this website.