[Pharo-users] Spec - vertically stacked Menu(Group)Model

Is it possible to force MenuModel to display its groups (and group's items) vertically instead of horizontally? The use case is having button palette to click on. Both world menu and subMenu of MenuItemModel render it this way but it is all hidden in the depths of Morphic. Is there any way how to switch this behavior at Spec level? (Or should I make it from scratch?) Peter