You mean a button in the top row menu if you open the inventory e.g.?
There's a librray to add a button, I think votan has provided it within some addons like PotionMaker.
Check the libs folder there for "LibMainMenu-2.0" (be sure to use libMainMenu 2, not LibMainMenu as this is another library provided by Ayantir within Superstar e.g. if I remember correctly, adding a scene for some menus!).
Search for code in the addon files (search for "LibMainMenu-2.0").
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