public override void Start()
        {
            base.Start();

            _workItems.Columns.Add(new TableColumn <WorkItem, string>(SR.ColumnPatient, w => w.PatientInfo)
            {
                WidthFactor = .7f
            });
            _workItems.Columns.Add(new TableColumn <WorkItem, string>(SR.ColumnStudy, w => w.StudyInfo)
            {
                WidthFactor = .9f
            });
            _workItems.Columns.Add(new TableColumn <WorkItem, string>(SR.ColumnActivityDescription, w => w.ActivityDescription)
            {
                WidthFactor = .7f
            });
            _workItems.Columns.Add(new TableColumn <WorkItem, string>(SR.ColumnStatus, w => w.Status.GetDescription())
            {
                WidthFactor         = .3f,
                TooltipTextProvider = w => string.IsNullOrEmpty(w.ProgressStatusDescription)
                                                                                                                                                ? string.Empty
                                                                                                                                                : w.ProgressStatusDescription,
                Comparison = WorkItem.StatusComparison
            });
            _workItems.Columns.Add(new TableColumn <WorkItem, string>(SR.ColumnStatusDescription, w => w.ProgressStatus)
            {
                WidthFactor = 1.5f
            });
            var requestedTimeColumn = new DateTimeTableColumn <WorkItem>(SR.ColumnRequestedTime, w => w.RequestedTime)
            {
                WidthFactor = .5f
            };

            _workItems.Columns.Add(requestedTimeColumn);
            _workItems.Columns.Add(new DateTimeTableColumn <WorkItem>(SR.ColumnScheduledTime, w => w.ScheduledTime)
            {
                WidthFactor = .5f
            });
            _workItems.Columns.Add(new TableColumn <WorkItem, string>(SR.ColumnPriority, w => w.Priority.GetDescription())
            {
                WidthFactor = .25f,
                Comparison  = WorkItem.PriorityComparison
            });
            _workItems.Columns.Add(new TableColumn <WorkItem, IconSet>(SR.ColumnProgress, w => w.ProgressIcon)
            {
                WidthFactor = .4f,
                Comparison  = WorkItem.ProgressComparison
            });


            // establish initial sort order
            _workItems.Sort(new TableSortParams(requestedTimeColumn, false));

            this.ActivityMonitor = WorkItemActivityMonitor.Create(true);
            _connectionState     = _connectionState.Update();

            this.ActivityMonitor.IsConnectedChanged += ActivityMonitorIsConnectedChanged;

            _localServerWatcher.DicomServerConfigurationChanged  += OnDicomServerConfigurationChanged;
            _localServerWatcher.StudyStorageConfigurationChanged += OnStorageConfigurationChanged;
            _localServerWatcher.DiskSpaceUsageChanged            += OnDiskspaceChanged;
        }