Currently the automatic positioning feature of the ACE menus is a little inconvenience and dumb. Basically, if you open a subMenu, contextMenu, or multiColumnMenu and there isn't enough space available below the root menuItem to display the entire thing, it will be displayed above the root menuItem.

This is fine so long as there is enough space above the root menuItem to display the entire contents of the subMenu, etc.. However, in many cases the root menuItem is placed near the top of the page, so the subMenu will be clipped by the top of the browser and you will have no way to view the entire contents.

A better approach is to only display the subMenu, etc. above the root menuItem if there is enough room to display the entire thing, otherwise, revert to displaying it below the root menuItem.

In addition, if the user specifies a menuPosition via the attribute, that position should ALWAYS be used, regardless of whether there is room for it there or not.