//used initially MECHANICALBLOCKSOPTIONS=0. The results differ if MECHANICALBLOCKSOPTIONS=1.
        [_AcTrx.CommandMethod("SR167025_getSetMechanicalProps_bmprops_mechMaterial")]
        public void SR167025_getSetMechanicalProps_bmprops_mechMaterial()
        {
            _AcAp.Document doc = _AcAp.Application.DocumentManager.MdiActiveDocument;
            _AcEd.Editor ed = doc.Editor;
            ed.WriteMessage($"\n => Use: dw//167025_bminsert_myBox_mechanicalComponent.dwg";);
            _AcDb.ObjectId id = _AcDb.ObjectId.Null;
            _AcEd.PromptEntityOptions peo = new _AcEd.PromptEntityOptions("Select a Mechanical component insert");
            peo.SetRejectMessage("Not a Block Reference!");
            //peo.AddAllowedClass(typeof(_AcDb.BlockReference), true);
            _AcEd.PromptEntityResult per = ed.GetEntity(peo);
            if (_AcEd.PromptStatus.OK == per.Status)
            {
                _AcDb.Database db = _AcDb.HostApplicationServices.WorkingDatabase;
                _AcDb.TransactionManager dbTrManager = db.TransactionManager;
                using (_AcDb.Transaction tr = dbTrManager.StartTransaction())
                {
                    _AcDb.BlockReference blockRef = tr.GetObject(per.ObjectId, _AcDb.OpenMode.ForRead) as _AcDb.BlockReference;
                    if (null != blockRef)
                    {
                        id = blockRef.ObjectId;
                        //eug, based on: C:\Program Files\Bricsys\BricsCAD V23 en_US\API\dotNet\CsBrxMgd\CsBrxMgd\MechanicalComponents.cs
                        _AcMec.ComponentInstance compInstance = _AcMec.ComponentInstance.GetComponentInstance(id);
                        if (compInstance == null)
                        {
                            ed.WriteMessage("\n => Err: the selected block doesn't contain MechanicalComponents");
                            return;
                        }
                        _AcMec.ComponentDefinition compDef = _AcMec.ComponentDefinition.GetComponentDefinition(compInstance.InstanceBlockId, false);

                        //string compName = compInstance.Name;
                        //string compDefName = compDef.Name;
                        //string compStatus = compDef.BomStatus.ToString();
                        //string compDescription = compDef.Description;
                        //uint compType = (uint)compDef.ComponentType;//eug added cast
                        ed.WriteMessage($"\nThe component insert name of the block reference with id={id} is {compInstance.Name} " +
                        $"\ncomponentDefinitionName: {compDef.Name}");

                        //eug: SR
                        //string materialName = compDef.Material;//temp
                        ed.WriteMessage($"\n => compDef.Material='{compDef.Material}', is empty instead of 'Wood'");//!

                        //* temp
                        /*
                        StringCollection parameterNames = _AcGc.Utility.GetBlockParameterNames(per.ObjectId);//eug: wrong call, needs a block REF id
                        if (0 == parameterNames.Count)
                        {
                            ed.WriteMessage($"\n => parameterNames.Count=0. ");
                        }
                        foreach (String value in parameterNames)
                        {
                            ed.WriteMessage("\n => Parameter Name is {0}", value);
                        }

                        _AcGc.ConstraintsGroup3d[] allConstraintsGroups3d = _AcGc.Utility.GetAllConstraintsGroups3d(doc.Database);
                        if (0 < allConstraintsGroups3d.Length)
                        {
                            ed.WriteMessage($"\n => allConstraintsGroups3d.Length={allConstraintsGroups3d.Length}. ");
                        }
                        */

                        _AcMec.ComponentDefinition compDef1 = _AcMec.ComponentDefinition.GetComponentDefinition(compDef.OriginalBlockId, false);//temp
                        ed.WriteMessage($"\n => compDef1.Material='{compDef1.Material}', is empty instead of 'Wood'");//temp

                        _AcMec.ComponentDefinition compDef2 = _AcMec.ComponentDefinition.GetComponentDefinition(per.ObjectId, false);
                        ed.WriteMessage($"\n => compDef2.Material='{compDef2.Material}', is empty instead of 'Wood'");//ok for exploded component
                    }

                    //if the main block ref would be first exploded, to get body_1
                    _AcDb.Solid3d solid3d = tr.GetObject(per.ObjectId, _AcDb.OpenMode.ForRead) as _AcDb.Solid3d;
                    if (null != solid3d)
                    {
                        id = solid3d.ObjectId;
                        _AcMec.ComponentInstance compInstance = _AcMec.ComponentInstance.GetComponentInstance(id);
                        if (compInstance == null)
                        {
                            ed.WriteMessage("\n => Err: the selected block doesn't contain MechanicalComponents");
                            return;
                        }
                        _AcMec.ComponentDefinition compDef = _AcMec.ComponentDefinition.GetComponentDefinition(compInstance.InstanceBlockId, false);
                        ed.WriteMessage($"\nThe component insert name of the selected solid with id={id} is {compInstance.Name} " +
                        $"\ncomponentDefinitionName: {compDef.Name}");
                        ed.WriteMessage($"\n => compDef.Material='{compDef.Material}', is empty instead of 'Wood'");

                        _AcMec.ComponentDefinition compDef1 = _AcMec.ComponentDefinition.GetComponentDefinition(compDef.OriginalBlockId, false);//temp
                        ed.WriteMessage($"\n => compDef1.Material='{compDef1.Material}', is empty instead of 'Wood'");//temp

                        _AcMec.ComponentDefinition compDef2 = _AcMec.ComponentDefinition.GetComponentDefinition(per.ObjectId, false);
                        ed.WriteMessage($"\n => compDef2.Material='{compDef2.Material}', is empty instead of 'Wood'");//ok for exploded component
                    }
                    tr.Commit();
                }
            }
        }