Overview

The menu widget is used to create navigation or context menus. Menu options are populated using the 'choices' and 'choice values' properties, and the user's selection is received in the application using the 'menu response' property. 

...

If the hover background color property is not set, then hovering over a menu option causes its class name to become "menu-hover". That allows you to define your own custom CSS for an option when it is hovered over.