In the old Safari Extension API, it was possible for a menu of options (in the same UI style as the system UI) to be attached to a toolbar button item, and shown on click. In the App Extension API, the documentation seems to suggest only an immediate command or a popover is available for toolbar buttons.
The user experiences of a menu vs a popover are very different. A fake "menu" of command links placed in a popover would very feel different from a simple dropdown menu presented when a toolbar button is clicked.
Are there any good ways to access/replicate the simple toolbar button menu UI/UX, using the safari app extension API?