I'm trying to add a button to the vanilla furnace radial menu but I can't get the uidebugger to show me any paths for any radial menus. The yellow boxes show around the radial menu buttons when I hover over them, but no paths are shown. Using the uidebugger RadialMenuLayer command only shows two paths, neither of which seem relevant.
I thought I might be able to use the PlayerUIElementClickEvent event and get some info that way, but it doesn't seem to fire for vanilla UI elements.
Is it actually possible to add custom buttons to radial menus, or am I barking up the wrong tree?