if (node.getValue() == "hiddenStructure")
        {
            var parent = node.getParent();
            parent.collapse();
            parent.clearChildNodes();
            parent.setPopulateNodesOnDemand(true);
            parent.expand();
        }

    //node event router
    function nodeEvent(sender, node, type)
    {
        switch (type)
        {
            case "expanded":
                nodeExpanded(sender, node);
                break;
            case "selected":
                nodeSelected(sender, node);
                break;
        }
    }

    //handler for node expanded event
    function nodeExpanded(tree, node)
    {

    }

    //handler for node selected event
    function nodeSelected(tree, node)
    {
        //if hidden structure node, repopulate parent's children
        if (node.getValue() == "hiddenStructure")
        {
            repopulateChildren(node.getParent());
            return;
        }

        var children = node.getChildNodes();
        for (var i = 0; i < children.length; i++)
        {
            if (children[0].getValue() == "hiddenStructure")
            {
                repopulateChildren(node);
                return;
            }
        }
    }

    function repopulateChildren(node)
    {
        node.collapse();
        node.clearChildNodes();
        node.setPopulateNodesOnDemand(true);
        node.expand();
    }




         OnNodeSelected="FlyTreeView_NodeSelected" ContextMenuID="TreeMenu" Style="overflow: hidden" PostBackOnSelect="true"
     OnNodeEventJavascript="nodeEvent">

        
                 Padding="2px;2px;2px;2px;" BorderColor="LightGray" BorderWidth="1px" BorderStyle="Solid" Font-Bold="true"/>