LoadOnDemand and maintaining tree state

[Ramon]

Hi,

I have a TreeView in a master page and use ExpandMode = webservice.  How can I maintain the state of the TreeView when redirecting to another page?  Previously when I was using ExpandMode = ServersideCallback, I can maintain the state by Session["TreeState"] = TreeView.GetXml() after expanding the node then loading the state back after redirecting.

Thanks.