/// <summary>
        /// Called when [render node].
        /// </summary>
        /// <param name="xNode">The x node.</param>
        /// <param name="doc">The doc.</param>
        protected override void OnRenderNode(ref XmlTreeNode xNode, Document doc)
        {
            base.OnRenderNode(ref xNode, doc);

            var dataTypeId = this.GetDataTypeId();
            var xpath = this.GetXPathFromCookie(dataTypeId);
            var xPathType = this.GetXPathFilterTypeFromCookie(dataTypeId);

            // resolves any Umbraco params in the XPath
            xpath = uQuery.ResolveXPath(xpath);

            var xDoc = new XmlDocument();
            XmlNode xmlDoc;
            if (!doc.Published)
            {
                xmlDoc = doc.ToPreviewXml(xDoc);
            }
            else
            {
                xmlDoc = doc.ToXml(xDoc, false);
            }

            var xmlString = "<root>" + xmlDoc.OuterXml + "</root>";
            var xml = XElement.Parse(xmlString);

            xNode.DetermineClickable(xpath, xPathType, xml);

            //ensure that the NodeKey is passed through
            xNode.Source = this.GetTreeServiceUrlWithParams(int.Parse(xNode.NodeID), dataTypeId);
        }
        /// <summary>
        /// Called when [before node render].
        /// </summary>
        /// <param name="sender">The sender.</param>
        /// <param name="node">The node.</param>
        /// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param>
        protected override void OnBeforeNodeRender(ref XmlTree sender, ref XmlTreeNode node, EventArgs e)
        {
            var xpath = this.GetXPathFromCookie(this.GetDataTypeId());
            var xPathType = this.GetXPathFilterTypeFromCookie(this.GetDataTypeId());
            var xDoc = new XmlDocument();

            var xmlNode = umbraco.library.GetMedia(int.Parse(node.NodeID), false).Current.OuterXml;

            var xmlString = "<root>" + xmlNode + "</root>";
            var xml = XElement.Parse(xmlString);

            node.DetermineClickable(xpath, xPathType, xml);

            //ensure that the NodeKey is passed through
            node.Source = this.GetTreeServiceUrlWithParams(int.Parse(node.NodeID), this.GetDataTypeId());

            base.OnBeforeNodeRender(ref sender, ref node, e);
        }