Hi I was just wondering if it's possible to use the Tree attribute and inherit from BaseTree to then append an admin node to an existing tree?

I'd like to add one to the end of the uCommerce tree so I tried:

[Tree("uCommerce", "uc_orderexport", "Order Export", sortOrder: 100)]
    public class OrderExportTree : BaseTree
    {
        public OrderExportTree(string application)
            : base(application)
        { 
        }

        public override void Render(ref XmlTree tree)
        {
            var exportNode = XmlTreeNode.Create(this);
            exportNode.NodeID = "uc_export";
            exportNode.Action = "javascript:openOrderExportPage();";
            exportNode.Icon = "../../../App_Plugins/UmbracoBackoffice/Icons/export_pastiche_order.png";
            exportNode.OpenIcon = "../../../App_Plugins/UmbracoBackoffice/Icons/export_pastiche_order.png";
            exportNode.HasChildren = false;
            exportNode.Menu = new List<IAction>();
            OnBeforeNodeRender(ref tree, ref exportNode, EventArgs.Empty);
            if(exportNode != null)
            {
                tree.Add(exportNode);
                OnAfterNodeRender(ref tree, ref exportNode, EventArgs.Empty);
            }
        }


        protected override void CreateRootNode(ref XmlTreeNode rootNode)
        {
        }

        public override void RenderJS(ref System.Text.StringBuilder Javascript)
        {
            Javascript.Append(
               @"function openOrderExportPage() {
                 UmbClientMgr.contentFrame('/UmbracoBackoffice/DataExportSurface/Index);
                }");
        }
    }

With no luck

is this possible?