It's not possible to navigate the menus created by QtQuick.Controls using the keyboard. I would expect it to work with cursor keys as well as the usual ALT+Letter combination for items that have assigned one.

It can only be brought up by mouse clicking if used in a MenuBar. Using the "&" symbol as with the widget-based QMenu (QAction) seems to be ignored (as in "&File"). If I call the "popup()" method on Menu, it will always appear below the mouse pointer, and again, keyboard navigation is not possible.