detachable menubars for XEmacs...

So... I implemented this for GTK (surprisingly simple) and they appear to work. My question is, how user-configurable should this be? Should it be a frame property that is honored at frame-creation time only (that would be fairly doable). Making it settable after frame creation could be kind of kludgey and flicker pretty weirdly for a second or so. Just curious. I plan on doing the same for toolbars. Would be really sweet to have a minibuffer that was detachable like that. How does the detached minibuffer work now? Could I just abuse that and say it is detached and give it a window that is really just sitting inside a GtkHandleBox? Would that work? What about detachable submenus? -Bill P.