public Result Execute(ExternalCommandData commandData,
                              ref string message,
                              ElementSet elements)
        {
            UIApplication uiapp  = commandData.Application;
            UIDocument    _uidoc = uiapp.ActiveUIDocument;

            Autodesk.Revit.ApplicationServices.Application _app = uiapp.Application;
            Autodesk.Revit.DB.Document _doc = _uidoc.Document;

            PlunkOClass     plunkThis          = new PlunkOClass(commandData.Application);
            string          wsName             = "MECH HVAC";
            string          FamilyName         = "M_BAS SENSOR";
            string          FamilySymbolName   = "THERMOSTAT";
            string          FamilyTagName      = "M_EQIP_BAS_SENSOR_TAG";
            string          FamilyTagNameSymb  = "TAG NUMBER ONLY";
            string          FamilyTagName2     = "M_DEVICE_BAS_TAG_SYM";
            string          FamilyTagNameSymb2 = "M-DATA-SENSOR";
            bool            hasLeader          = false;
            bool            oneShot            = true;
            BuiltInCategory bicTagBeing        = BuiltInCategory.OST_MechanicalEquipmentTags;
            BuiltInCategory bicTagBeing2       = BuiltInCategory.OST_DataDeviceTags;
            BuiltInCategory bicFamily          = BuiltInCategory.OST_DataDevices;
            BuiltInCategory bicMechItem        = BuiltInCategory.OST_MechanicalEquipment;
            Element         elemPlunked;
            bool            keepOnTruckn = true;

            while (keepOnTruckn)
            {
                try {
                    Result     result  = plunkThis.PlunkThisFamilyType(FamilyName, FamilySymbolName, wsName, bicFamily, out elemPlunked, oneShot);
                    FormMsgWPF formMsg = new FormMsgWPF();
                    if ((result == Result.Succeeded) & (elemPlunked != null))
                    {
                        plunkThis.AddThisTag(elemPlunked, FamilyTagName2, FamilyTagNameSymb2, "Offset Stat", bicTagBeing2, true);
                        formMsg.Show();
                        formMsg.SetMsg("Now Select the Mech Unit for this sensor.", "Offset Sensor For MEQ");
                        Transaction tp = new Transaction(_doc, "PlunkOMatic:SymVis");
                        tp.Start();
                        Parameter parForVis = elemPlunked.LookupParameter("SHOW SYM");
                        if (null != parForVis)
                        {
                            parForVis.Set(0);
                        }
                        plunkThis.OrientTheInsides(elemPlunked);  // left in in case type is changed later
                        tp.Commit();

                        ICollection <BuiltInCategory> categories = new[] { bicMechItem };
                        ElementFilter    myPCatFilter            = new ElementMulticategoryFilter(categories);
                        ISelectionFilter myPickFilter            = SelFilter.GetElementFilter(myPCatFilter);
                        try {
                            Reference pickedElemRef = _uidoc.Selection.PickObject(ObjectType.Element, myPickFilter, "Select the Mech Unit for this sensor.");
                            Element   pickedElem    = _doc.GetElement(pickedElemRef.ElementId);
                            formMsg.SetMsg("Now place the unit text at the sensor.", "Offset Sensor For MEQ");
                            plunkThis.AddThisTag(pickedElem, FamilyTagName, FamilyTagNameSymb, "Offset Stat", bicTagBeing, hasLeader);
                            formMsg.Close();
                        } catch (Exception) {
                            formMsg.Close();
                            keepOnTruckn = false;
                            //throw;
                        }
                    }
                    else
                    {
                        formMsg.Close();
                        keepOnTruckn = false;
                    }
                } catch (Exception) {
                    keepOnTruckn = false;
                    //throw;
                }
            }
            return(Result.Succeeded);
        }
        public Result Execute(ExternalCommandData commandData,
                              ref string message,
                              ElementSet elements)
        {
            UIApplication uiapp  = commandData.Application;
            UIDocument    _uidoc = uiapp.ActiveUIDocument;

            Autodesk.Revit.ApplicationServices.Application _app = uiapp.Application;
            Autodesk.Revit.DB.Document _doc = _uidoc.Document;

            PlunkOClass     plunkThis         = new PlunkOClass(commandData.Application);
            string          wsName            = "MECH HVAC";
            string          FamilyName        = "M_BAS SENSOR";
            string          FamilySymbolName  = "THERMOSTAT";
            string          pName             = "STAT ZONE NUMBER";
            string          FamilyTagName     = "M_EQIP_BAS_SENSOR_TAG";
            string          FamilyTagNameSymb = "SENSOR";
            bool            oneShot           = true;
            bool            hasLeader         = false;
            BuiltInCategory bicTagBeing       = BuiltInCategory.OST_MechanicalEquipmentTags;
            BuiltInCategory bicFamily         = BuiltInCategory.OST_DataDevices;
            BuiltInCategory _bicMechItem      = BuiltInCategory.OST_MechanicalEquipment;
            Element         elemPlunked;
            bool            keepOnTruckn = true;

            while (keepOnTruckn)
            {
                try {
                    Result     result  = plunkThis.PlunkThisFamilyType(FamilyName, FamilySymbolName, wsName, bicFamily, out elemPlunked, oneShot);
                    FormMsgWPF formMsg = new FormMsgWPF();
                    if ((result == Result.Succeeded) & (elemPlunked != null))
                    {
                        formMsg.Show();
                        formMsg.SetMsg("Now Select the Mech Unit for this sensor.", "Sensor For MEQ");
                        Transaction tp = new Transaction(_doc, "PlunkOMatic:OrientGuts ");
                        tp.Start();
                        plunkThis.OrientTheInsides(elemPlunked);
                        tp.Commit();
                        ICollection <BuiltInCategory> categories = new[] { _bicMechItem };
                        ElementFilter    myPCatFilter            = new ElementMulticategoryFilter(categories);
                        ISelectionFilter myPickFilter            = SelFilter.GetElementFilter(myPCatFilter);
                        try {
                            Reference pickedElemRef = _uidoc.Selection.PickObject(ObjectType.Element, myPickFilter, "Select the Mech Unit for this sensor.");
                            Element   pickedElem    = _doc.GetElement(pickedElemRef.ElementId);
                            formMsg.SetMsg("Now place the unit text at the sensor.", "Sensor For MEQ");
                            plunkThis.AddThisTag(pickedElem, FamilyTagName, FamilyTagNameSymb, pName, bicTagBeing, hasLeader);
                            formMsg.Close();
                        } catch (Exception) {
                            formMsg.Close();
                            keepOnTruckn = false;
                            //throw;
                        }
                    }
                    else
                    {
                        formMsg.Close();
                        keepOnTruckn = false;
                    }
                } catch (Autodesk.Revit.Exceptions.OperationCanceledException) {
                    keepOnTruckn = false;
                    //    TaskDialog.Show("Where", "here  " );
                }
            }
            return(Result.Succeeded);
        }