Might I suggest ger's mod.. I used his to make mine. All I did was add the titles on the window when is not over window.
I would link to his file, but for some reason it is no longer up. Let me make a non title version of mine. I will preserve the on hover mouse turns on control buttons.
It's awaiting reapproval. I fixed a mistake I made in slot naming on the full-size, removed the problematic click-through code, and changed the grab handle to have the bag name as its tooltip.