If I understand correctly, I should replace ".selector" with the list container I wish to render as a ui-menu, and then replace ".ui-menu-item:last" with a selector that will match the ID of the list item I want to focus. Correct?
The error message seems to indicate that this entity menu on which the find() method is invoked is a div element, though the selector I'm using returns a ul. So maybe I need a selector for menu? I tried the following: