Hi Marc,
maybe suhajdab's answer can help you:
http://forum.jquery.com/topic/making-a-diolog-box-open-another-dialog-box-wh...
P.S. In "Ajax event handler for single column change" you are using $url; it should be url because this is not a jQuery object.
I fixed the issue and pushed to the repo. Please check that. Thank for the
help.
Regards, Thilanka.