public void RetrieveProcessedQueueItems(TimeSpan timeSpan)
        {
            if (_mgr.MonitorQueues.Length == 0)
            {
                return;
            }

            List <QueueItem> items = new List <QueueItem>();

            // TODO: Solve why we can not iterate thru Remote MQ,
            // both GetMessageEnumerator2() and GetAllMessages() should be available for
            // Remote computer and direct format name, but returns zero (0) messages always
            //if( !Tools.IsLocalHost(_serverName) )
            //  return;
            DateTime since = DateTime.Now - timeSpan;

            foreach (QueueType t in Enum.GetValues(typeof(QueueType)))
            {
                if (_monitorState.MonitorQueueType[(int)t])
                {
                    var r = _mgr.GetProcessedMessages(t, since, _items.AsEnumerable <QueueItem>());
                    items.AddRange(r.Items);
                }
            }

            bool changed = false;

            lock ( _itemsLock ) {
                // Add new items
                foreach (var itm in items)
                {
                    if (!_items.Any(i => i.Id == itm.Id))
                    {
                        _items.Add(new QueueItemViewModel(itm, _mgr.MessagesHasMilliSecondPrecision));

                        if (!changed)
                        {
                            changed = true;
                        }
                    }
                }
            }

            if (changed)
            {
                _items.Sort((a, b) => b.ArrivedTime.CompareTo(a.ArrivedTime));

                OnItemsChanged(ItemChangeOrigin.Queue);
            }
        }