Hi,

I have treeview which works fine without ajax. Then I added update panel to the page. But this time, when a node is selected (not collapse or expand) on treeview, it strangely add the previous expanded childnodes to treeview. These make some duplicate nodes on treeview.

Any suggestions please?

I love MS Ajax. Treeview is going ot have issues with update panel. Here is the link to the list of incompatable controls.
http://ajax.asp.net/docs/overview/Up...aspx#Scenarios

Funny thing is when it was called Atlas I saw an example using the treeview but it looks like they had bugs with it in certain instances.