Where are the tooltips?

[Delameko Stone]

I've been tweaking my custom UI to work. I've had to remove hotbars, bags etc. to use the default ones.

The only thing I'm still having a problem with, however, is tooltips. I can't get them to appear and I've remove a few different UI pieces but I still get an error whenever I hover over something.

So what file overwrites tooltips? So that I can remove it...

Cheers