Hi,

I am trying to use the DemandLoad event using the basic Tree with EnableViewState set to false and LoadOnDemand set to ManualSmartCallbacks. (This requirement for load on demand i read on your site, if i set the EnableViewState to TRUE then everything works good)

<ignav:UltraWebTree ID="UltraWebTree1" runat="server" Height="197px"
                                         LoadOnDemand="ManualSmartCallbacks"
                        EnableViewState="false" AutoPostBack="true" ondemandload="UltraWebTree1_DemandLoad"
                        onnodeclicked="UltraWebTree1_NodeClicked" >
                    </ignav:UltraWebTree>

and following code load the nodes on demand

 protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            UltraWebTree1.Nodes.Add("Rajan").ShowExpand = true;
           }
    }
    protected void UltraWebTree1_DemandLoad(object sender, Infragistics.WebUI.UltraWebNavigator.WebTreeNodeEventArgs e)
    {
        if (Page.IsPostBack)
        {
            Random rand = new Random();
            int nextRandom = rand.Next(12);

            for (int i = 0; i <= nextRandom; i++)
            {
                Node newNode = new Node();
                newNode.Text = "NewNode" + i;
                newNode.LoadOnDemand = true;
                e.Node.Nodes.Add(newNode);
                UltraWebTree1.Nodes.Add(e.Node).ShowExpand = true;
            }
           
        }
    }