In my wandering I have seen conflicting reports on if you can use a ViewStack/TabNav/Accordian component within a popup. The following link's author appeared to be having an issue memory wise when they used one of these components in a popup.
http://www.adobe.com/cfusion/webforums/forum/messageview.cfm?forumid=60&catid=585&threadid=1180780&enterthread=y So can you use a ViewStack in a popup without memory problems? Thanks, - Kyle