public static void SynchronizeAttributes(this BlockTableRecord target)
        {
            if (target == null)
            {
                throw new ArgumentNullException("target");
            }

            Transaction tr = target.Database.TransactionManager.TopTransaction;

            if (tr == null)
            {
                throw new Autodesk.AutoCAD.Runtime.Exception(ErrorStatus.NoActiveTransactions);
            }
            List <AttributeDefinition> attDefs = target.GetAttributes(tr);

            foreach (ObjectId id in target.GetBlockReferenceIds(true, false))
            {
                BlockReference br = (BlockReference)tr.GetObject(id, OpenMode.ForWrite);
                br.ResetAttributes(attDefs, tr);
            }
            if (target.IsDynamicBlock)
            {
                target.UpdateAnonymousBlocks();
                foreach (ObjectId id in target.GetAnonymousBlockIds())
                {
                    BlockTableRecord btr = (BlockTableRecord)tr.GetObject(id, OpenMode.ForRead);
                    attDefs = btr.GetAttributes(tr);
                    foreach (ObjectId brId in btr.GetBlockReferenceIds(true, false))
                    {
                        BlockReference br = (BlockReference)tr.GetObject(brId, OpenMode.ForWrite);
                        br.ResetAttributes(attDefs, tr);
                    }
                }
            }
        }