I save the tree state in the session as its accessed on every page. My node objects are fairly light and I remove the nodes in closed folders (so the memory is freed) so I'm not that concerned about it being a scaling issue. If a user had tens of thousands of nodes viewable at the same time the page would be unusable slow to load. -Dustin View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4089383#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...