I'm not sure if this is something I missed previously, or if it's new to 10.3.2.
Accessing Menus and Dialog Boxes
Menus and dialog boxes are two of the most common and standardized UI elements in the Windows operating system. Menus group related commands into lists, dialog boxes group important functions into windows. Be sure that keyboard users can enter and exit menus by pressing the ALT key. To prevent menus from becoming too long and unwieldy, configure them so that most of the commands are hidden from view until the user requests access to the full list.