Accept on Enter for all "Accept Item" windows

[Sigrdrifa]

There are a number of popup windows that appear after, say, transmuting an item, or clicking a Thalumbra Umbrite Chest, where the user is forced to move the mouse and click an "Accept" button to put the loot in inventory.

I've been looking at my UI files, but I don't see which file(s) are involved. Would this be something that you do with an "OnEnter" event?