Does anyone remember how to open the show race menu fgor NPCs.

I never heard of such a thing.

You can change the NPCs race by using setrace [insert race here]. I dont think you can use showracemenu on NPCs.

EDIT: You can try using this: http://www.skyrimnexus.com/downloads/file.php?id=4554

There's a program on the nexus that allows you to change that sort of thing. In game, I've not heard of such a command.