TreeView, UpdatePanel PopulateOnDemand problem

When I use a PopulateOnDemand TreeView inside an UpdatePanel - when I click on the root node to populate its immediate children, it expands with the child nodes displayed. If I then click on any of the child nodes, the root node collapses. This does not happen if not in an UpdatePanel.

Also, if I click on the root node again and then click on an immediate child to populate its children, it has the same behavior. After the root node automatically collapses, if I click on the root node again, all child nodes that were expanded will still be expanded.

Does anyone know how I can get the root node to not automatically collapse when I click on any of its descendent nodes?

The TreeView isn't supported inside an UpdatePanel, see the last bullet point on this blog and follow the UpdatePanel doc link:http://blogs.visoftinc.com/archive/2007/09/23/asp.net-ajax--updatepanel-not-working--common-problems.aspx

PopulateOnDemand PopulateNodesFromClient actually uses client script as it is.

-Damien

Thanks for the response. When you say that it uses client script, what does that mean? PopulateOnDemand seems to cause full page refreshes - even when I use EnableClientScript and PopulateNodesFromClient...

That's what PopulateNodesFromClient does:http://msdn2.microsoft.com/en-us/library/system.web.ui.webcontrols.treeview.populatenodesfromclient.aspx.

The example states:"The following code example demonstrates how to use thePopulateNodesFromClient property to enable client-side population of the nodes in theTreeView control. Notice that when client-side node population is enabled, nodes are populated dynamically on the client, without the need to post back to the server."

-Damien

Thanks. My point was that it still caused a full page refresh. If it was happening on the client (using Ajax), then I wouldn't see a full page refresh. It turns out that I had to take out my TreeNodeExpanded and TreeNodeCollapsed event handlers to get rid of the full page refresh. After doing that, though, child nodes (that definitely have a parent node) have their Parent property set to null.

I am making headway though...thanks for your help.

You may want to check out this:http://steveorr.net/articles/Ajax.aspx

-Damien

Thanks. Good article. But it still does not explain why the Parent property is null on a child node. Again, this only happens with EnableClientScript, PopulateNodesFromClient and without TreeNodeExpanded and TreeNodeCollapsed event handlers. I need the Parent node for context so I can populate nodes more than 2 deep.