stafford said:

Simplified:  The code below will only work to the 1st child of root if UltraWebTree.LoadOnDemand=ManualSmartCallbacks.

To expand upon this a little:  If you can encode enough information in the original node's DataPath property to be able to determine or recreate what "e.Node.Text" is in the previous post, and if you set the new nodes DataPath property in a similar fashion (remember that a DataPath should be unique), then ManualSmartCallbacks can accomplish this task.

Thanks so much for this article.  There are alot of topics that are related to this problem, however it would seem this is the only one that actually spells out the answer :)

Simplified:  The code below will only work to the 1st child of root if UltraWebTree.LoadOnDemand=ManualSmartCallbacks.  To get the code to work as expected, enclose the UltraWebTree in a WebAsyncRefreshPanel and set UltraWebTree.LoadOnDemand=Manual.  Voila!

Thanks again for this post.

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Node n = new Node();
            n.Text = "Root";
            n.ShowExpand = true;
            UltraWebTree1.Nodes.Add(n);
        }
    }
    protected void UltraWebTree1_DemandLoad(object sender, Infragistics.WebUI.UltraWebNavigator.WebTreeNodeEventArgs e)
    {
        Node n = new Node();
        n.Text = e.Node.Text;
        n.ShowExpand = true;
        e.Node.Nodes.Add(n);
    }

Yes, that's true. I noticed a reduction in speed when I switched to using the WARP. But, I didn't have a choice really.

I strongly recommend that Infragistics look at implementing web service calls as part of the Ajax control experience. It gets around all the problems with partially posting back etc.

Thanks for posting your code, as this may help someone else with a similar setup.

You're correct in supposing that a WARP is very similar to the UpdatePanel from the ASP.NET AJAX Extensions toolset.

I can also comment on the "why" both Manual+WARP and ManualSmartCallbacks exist - because ManualSmartCallbacks was introduced before WARP and UpdatePanel were created.  The other benefit to using ManualSmartCallbacks is that it passes less data from the client to the server and back, which may have improve the performance of your website slightly.

Thanks yes you are right.