Automatic pop-up closing: new pop-up are not automatically displayed when there is another engine to close first

Right now when you open a "add new container" engine (and forget it on the back-end) and try to reopen another "update container" engine, this correctly close the first one, but the second one is never opened.

The process work on engine of the same type (two update container engine) but does not work in--between various engines (add new and update engines).

Tested both with IE6 and ff2