Treeview not working in Beta 1.0?

I have a treeview that used to work in CTP July version but stopped working after I installed the beta version.

The first problem: say I have node A and it has at least one child. If I expand node A (by clicking the + button) then click on the name of the node, it readds the children, effectively doubling the number of the nodes. I could continue adding the children of the nodes resulting is multiple children being added.

The second problem relates to the first one. Expand node A, expand node B, select node B then select one of node B's child. Somehow one of node A's child is expanded.

The third one: I can't expand more than two levels. Everytime I try to do it, this error message appears:

Line: 82
Error: 'undefined' is null or not an object

Looking at source, the line that breaks it is this:

table.insertAdjacentHTML("afterEnd", chunk);

All of the nodes have PopulateOnDemand = true. Am I doing something totally wrong or is it really a bug in the beta 1.0? Every other controls (including the ones from value pack) seems to work properly except this treeview. :(

For reference here's what I have on the aspx page:

<div class="BrowserTreeView">
<asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:TreeView ID="tvDirectory" runat="server" OnTreeNodePopulate="PopulateNode" OnPreRender="tvDirectory_PreRender" OnSelectedNodeChanged="tvDirectory_SelectedNodeChanged" SkinID="Explorer"></asp:TreeView>
</ContentTemplate>
<Triggers>
<asp:AsyncPostbackTrigger ControlID="cmbComputer" EventName="SelectedIndexChanged"></asp:AsyncPostbackTrigger>
<asp:AsyncPostbackTrigger ControlID="cmdOpen" EventName="Click"></asp:AsyncPostbackTrigger>
</Triggers>
</asp:UpdatePanel>
</div>

Please see these two articles:

- What's up with UpdatePanels and how come nothing works? (http://forums.asp.net/thread/1440058.aspx)
This is a higher level piece that explains how UpdatePanel changed from being automatic (and broken) in the CTP to the new functionality in the beta.

- HOWTO: Write controls compatible with UpdatePanel without linking to the ASP.NET AJAX DLL (http://forums.asp.net/thread/1445844.aspx)
This article goes in depth on how to use the new registration APIs on ScriptManager, but without linking to the Atlas assembly.

Thanks,

Eilon

Thanks. I didn't know that treeview is not supported yet.