public string GetConstructionNotes(ID8TopLevel topLevel, IEnvelope FilterExtent)
        {
            //Parse the Design Tree
            ID8List TopList = topLevel as ID8List;

            TopList.Reset();

            IMMPxApplication PxApp = null;

            try
            {
                PxApp = DesignerUtility.GetPxApplication();
            }
            catch (Exception ex)
            {
                ToolUtility.LogError(_ProgID + ": Could obtain a Px Application reference.", ex);
                return(_defaultDisplay);
            }

            try
            {
                TopList.Reset();
                ID8List WorkRequest = TopList.Next(false) as ID8List;
                if (WorkRequest == null)
                {
                    return("");
                }

                //WorkRequest.Reset();
                //ID8List Design = WorkRequest.Next(false) as ID8List;

                //Get the Design XML
                IMMPersistentXML WrXml = WorkRequest as IMMPersistentXML;

                string result = Utility.LabellingUtility.GetConstructionNotes(PxApp, WrXml, FilterExtent);
                if (string.IsNullOrEmpty(result))
                {
                    return(_NoFeatures);
                }
                else
                {
                    return(result);
                }
            }
            catch (ApplicationException apex)
            {
                //ignore exception, no features
                return(_NoFeatures);
            }
            catch (Exception ex)
            {
                ToolUtility.LogError(_ProgID + ": Error Retrieving Construction Notes", ex);
                return(_defaultDisplay);
            }
        }