another.cs

        public void HideProgress()
        {
            if (!CheckAccess())
            {
                Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.DataBind,
                    new EventHandler(delegate(object o, EventArgs e)
                    {
                        this.HideProgress();
                    }), this, EventArgs.Empty);
                return;
            }

            _progressLabel.Visibility = Visibility.Hidden;
            _progressLabel.Content = null;
            _progressBar.Visibility = Visibility.Hidden;
            _progressBar.Value = 0;
            
            // HACK: Application.DoEvents
            // RLH -- I HATE having this call here, it shouldn't need to be here, but doesn't seem to work otherwise...
            System.Windows.Forms.Application.DoEvents();
        }

DoEvents.cs

        private bool DoSearch(SearchParams searchParams)
        {
            bool success = false;
            try
            {
                if (searchParams.Cameras.Count > 0)
                {
                    ISearch search = new Search();
                    search.InputStreams.AddRange(searchParams.Cameras);

                    search.TimeEnd = searchParams.EndTime;
                    search.TimeStart = searchParams.StartTime;
                    search.ApplySourceTimeOffset = false;

                    _searchComplete = false;
                    search.SearchProgressChanged += Search_ProgressChanged;
                    search.SearchCompleted += Search_Completed;
                    _application.MainPage.ShowProgress(Properties.Resources.ModifySearch_Searching_MainInstruction, 0);
                    search.PerformSearchAsync();

                    while (!_searchComplete)
                    {
                        System.Windows.Forms.Application.DoEvents();
                        System.Threading.Thread.Sleep(20);
                    }

                    if (search.Cameras.Count > 0)
                    {
                        success = true;

                        // Finally render the output.
                        RenderGroup inputGroup = RenderGroupHelper.GenerateRenderGroup(search.InputStreams);
                        RenderGroup rg = RenderGroupHelper.GenerateSearchResultRenderGroup(search, inputGroup);

                        // Create a new RenderPanel output content for the new search.
                        RenderPanel panel = RenderPanelHelper.GenerateBasicSearchPlaybackRenderPanel(inputGroup);
                        RenderOutput(search, rg, panel);

                        // Start playing the new search, this wasn't required before
                        search.Play();
                    }
                }
            }
            catch (Exception)
            {
            }
            finally
            {
                ResetState();
            }
            return success;
        }