menulist->listItem->sublistItem?

hi:
if i have a listItem which is belong to a menulist, i want to this listItem have more sub listItem.
i found the class of listItem don't have this api. i think is there other way to get it?

A MenuList consists of a List and a Button, which shows the list when clicked.

I think what you're asking is if it is possible to add a List to another List, so you can have menu's with depth greater than 1. This is currently not available, but I plan to support it. Eventually.