How do I budget my texture memory for my UI?

Hey Folks

I was wondering how to budget my texture memory for my UI, and how it is loaded. I know I can see scene texture budget using statistics, but I have been unable to figure out how to see my memory usage for UI.

I also was wondering if it is something that is loaded up constantly, even if the HUD is not being drawn, or if it is something that only is in memory if the HUD using it is active.

Any info would be much appreciated!

Alex