Is there a place I can see images of the the menu to go with the menu names?

The following is not working:

if UI.IsMenuOpen("LevelUp Menu")

But this one is working:

if UI.IsMenuOpen("InventoryMenu")

So I think I may not be using the correct menu. I want the one that shows the perks trees and player level (the looking up at the starts background).

I think you're looking for "StatsMenu" - I'm not positive but I think "LevelUp Menu" might just be the one that asks you to choose your Health/Magicka/Stamina increase when you level up.

Thanks! that was it indeed!