Sub-menu/multi-level context menu - Vaadin Spreadsheet

Currently, is there any way to create a multi-level context menu for Vaadin Spreadsheet using the built-in ActionHandler framework?

It looks to me like this is not possible, and that I will have to implement my own context menu using the ContextMenu add-on. Is that correct?

As an example of what I'm talking about, if you right-click on a cell in Excel, the context menu includes "Filter" and "Sort" entries, which are submenus, not actions themselves. I want to do something similar.

As far as I know, that's correct. I'd like to point out that multi-level menus are generally considered quite poor usability, so do consider if you can present the options in some other manner.

-Olli

Yeah we're certainly trying to avoid it. There's no way to add horizontal separators either, is there?

I haven't looked into it, but my first thought would be to try to do it with styles. 

-Olli