Hello Jerome,

There is scrollIntoView javascript function

http://news.infragistics.com/forums/p/41411/230834.aspx#230834

In order to take advantage of it I recommend you handling Initialize client event.

On the server side you can select the desired item and check in the Initialize event if there are selected items.

   function WebDataTree1_Initialize(sender, eventArgs) {

            ///<summary>

            ///

            ///</summary>

            ///<param name="sender" type="Infragistics.Web.UI.ControlMain"></param>

            ///<param name="eventArgs" type="Infragistics.Web.UI.EventArgs"></param>

            //Add code to handle your event here.

            var tree = $find('WebDataTree1');

            if (tree.get_selectedNodes()[0] != null)

                tree.get_selectedNodes()[0].get_element().scrollIntoView();

        }

       <ig:WebDataTree ID="WebDataTree1" runat="server" Height="100px" Width="200px" DataSourceID="XmlDataSource1"

            SelectionType="Single" InitialDataBindDepth="3" InitialExpandDepth="3" OnUnload="WebDataTree1_Unload">

            <ClientEvents Initialize="WebDataTree1_Initialize" />

            <DataBindings>

                <ig:DataTreeNodeBinding DataMember="Customer" TextField="CustomerName" ValueField="CustomerID"

                    Depth="1" />

                <ig:DataTreeNodeBinding DataMember="Order" TextField="OrderID" ValueField="OrderID"

                    Depth="2" />

                <ig:DataTreeNodeBinding DataMember="OrderDetail" TextField="ProductName" ValueField="ProductID"

                    Depth="3" />

            </DataBindings>

        </ig:WebDataTree>

protected void Button1_Click(object sender, EventArgs e)

        {

            WebDataTree1.ClearSelection();

            WebDataTree1.Nodes[0].Nodes[2].Nodes[0].Selected = true;

            WebDataTree1.ActiveNode = WebDataTree1.Nodes[0].Nodes[2].Nodes[0];          

        }

Please let me know if you have other questions.