I am using a Ribbon containing Splitbuttons and DropDownButtons. Under these I want to make SubMenu's with a few MenuItems (like the old Menubar pulldown menu's with two (or more) stages). Now the SplitButton and DropDownButton each can have their appropriate Icons attached to it and also the MenuItems have their Icons, but the Submenu itself doesn't show up with an icon, see image. Although in the customize ribbon menu there is an option to attach an icon to the submenu, as soon as you klick Apply the icon is detached.
It would be nice if submenu's also can have icons attached to it.