>> The problem I see is in MDI applications, the purpose of dockable forms, is to be abble to dock it, but at the same time you can maximize other windows, do you see my point?

Yes, I understand your point, but unhappily the control isn't working correctly in toolbar and I still can't find the cause.
There's a lot of weird things when you place the control in a toolbar (show the popup menu in another opened form, for example).
This bugs are bugging me. :(