Hello,

You can use the client-side object model of the treeview (CSOM) and the getNodes method in particular (getNodes(true) mean recursive search) to obtain all nodes in the tree. Then implementing a FindNodeByText() method, finding a node and selecting it  will look something like this

<ignav:UltraWebTree ID="UltraWebTree1" runat="server" DefaultImage=""
        HiliteClass="" HoverClass="" Indentation="20">
        <ClientSideEvents NodeClick="nodeClickHandler" />       
        <Levels>
            <ignav:Level Index="0" />
        </Levels>
        <Nodes>
            <ignav:Node Text="Root Node">
                <Nodes>
                    <ignav:Node Text="Child Node">
                    </ignav:Node>
                    <ignav:Node Text="Child Node">
                    </ignav:Node>
                    <ignav:Node Text="Child Node">
                    </ignav:Node>
                </Nodes>
            </ignav:Node>
            <ignav:Node Text="Root Node">
                <Nodes>
                    <ignav:Node Text="Child Node">
                    </ignav:Node>
                    <ignav:Node Text="Child Node">
                    </ignav:Node>
                    <ignav:Node Text="NY">
                    </ignav:Node>
                </Nodes>
            </ignav:Node>
            <ignav:Node Text="Root Node">
                <Nodes>
                    <ignav:Node Text="Child Node">
                    </ignav:Node>
                    <ignav:Node Text="Child Node">
                    </ignav:Node>
                    <ignav:Node Text="Child Node">
                    </ignav:Node>
                </Nodes>
            </ignav:Node>
        </Nodes>
    </ignav:UltraWebTree>
   
    <script language="javascript">

    
        function FindNodeByText(tree, text) {
            var nodes = tree.getNodes(true);
            for (var i = 0; i < nodes.length; i++)
            {
                if (nodes[i].getText() == text)
                {
                    return nodes[i];
                }
            }           
        }

        function selectNY() {
            var tree = igtree_getTreeById("<%= UltraWebTree1.ClientID %>");
            var node = FindNodeByText(tree, "NY");
            if (node != null)
            {
                tree.setSelectedNode(node);
            }
        }
   
    </script>
   
    <input type="button" onclick="selectNY()" id="Button1" value="Select NY" />
    

More info on that can be found in the online help located here: (CSOM section)

http://help.infragistics.com/NetAdvantage/NET/2008.2/CLR2.0/