[Threshold]

Well... if it wasn't at all possible to see, the APPEARANCE of it. You can select items using 'spacebar' rather than clicking an item. Items are more in row and column form, and you can have more than one option on a single line. You use the arrow keys to select an items, and press Enter/Return to close the menu. Each of these actions has their own callback such as OnPlayerExitMenu. Simple enough if you know what to search for, it's very easy to create a menu with the right research...