I have the same question

My thinking is that i have to extend the AddNode funtion in Dotnetnuke.dll with following code

private static void AddNode(TabInfo objTab, DNNNodeCollection objNodes, Hashtable objBreadCrumbs, PortalSettings objPortalSettings, ToolTipSource eToolTips)
        {
            DNNNode objNode = new DNNNode();
            if (objTab.Title == "~")
            {
                objNodes.AddBreak();
            }
            else
            {
                if (objBreadCrumbs.Contains(objTab.TabID))
                {
                    objNode.BreadCrumb = true;
                    if (objTab.TabID == objPortalSettings.ActiveTab.TabID)
                    {
                        objNode.Selected = true;
                    }
                }
                if (objTab.DisableLink)
                {
                    objNode.Enabled = false;
                }
                objNode.ID = objTab.TabID.ToString();
                objNode.Key = objNode.ID;
                if (!String.IsNullOrEmpty( objTab.Title))
                {
                    objNode.Text = objTab.Title;
                }
                else if (!String.IsNullOrEmpty(objTab.Description))
                {
                    objNode.Text = objTab.Description;
                }
                else
                {
                    objNode.Text = objTab.LocalizedTabName;
                }

                
                objNode.NavigateURL = objTab.FullUrl;
                objNode.ClickAction = eClickAction.Navigate;
                objNode.Image = objTab.IconFile;
                objNode.LargeImage = objTab.IconFileLarge;
                switch (eToolTips)
                {
                    case ToolTipSource.TabName:
                        objNode.ToolTip = objTab.LocalizedTabName;
                        break;

                    case ToolTipSource.Title:
                        objNode.ToolTip = objTab.Title;
                        break;

                    case ToolTipSource.Description:
                        objNode.ToolTip = objTab.Description;
                        break;
                }
                objNodes.Add(objNode);
            }
        }