RadTreeView for ASP.NET AJAX
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RadControls for ASP.NET AJAX

To scroll to the selected TreeNode after an ajax request has occurred you should use the OnEndRequest client-side event of MS.NET AJAX and select the node in the OnEndRequest event handler, like:

CopyASPX
<script type="text/javascript">

    var prm = Sys.WebForms.PageRequestManager.getInstance();
    prm.add_endRequest(OnEndRequest);
    function OnEndRequest(sender, args) {
        var tree = $find("<%= RadTreeView1.ClientID %>");
        var selectedNode = tree.get_selectedNode();
        if (selectedNode != null) {
            selectedNode.scrollIntoView();
        }
    }
</script>