/// <summary>
        /// Handles the Click event of the btnFindReferences control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="RoutedEventArgs"/> instance containing the event data.</param>
        private void btnFindReferences_Click(object sender, RoutedEventArgs e)
        {
            if (this.SharedStepsInitialViewModel.SelectedSharedStep == null)
            {
                ModernDialog.ShowMessage("No shared step selected.", "Warning", MessageBoxButton.OK);
                return;
            }
            progressBar.Visibility = System.Windows.Visibility.Visible;
            mainGrid.Visibility    = System.Windows.Visibility.Hidden;
            this.SharedStepsInitialViewModel.ObservableTestCases.Clear();
            List <TestCase> filteredTestCases = new List <TestCase>();
            Task            t = Task.Factory.StartNew(() =>
            {
                log.InfoFormat("Find all reference Test Cases for Shared Step with id: {0} ", this.SharedStepsInitialViewModel.SelectedSharedStep.Id);
                filteredTestCases = TestCaseManager.FindAllReferenceTestCasesForShareStep(ExecutionContext.TestManagementTeamProject, ExecutionContext.Preferences.TestPlan, this.SharedStepsInitialViewModel.SelectedSharedStep.Id);
                this.SharedStepsInitialViewModel.InitialTestCaseCollection = filteredTestCases;
            });

            t.ContinueWith(antecedent =>
            {
                filteredTestCases = this.SharedStepsInitialViewModel.FilterTestCases();
                filteredTestCases.ForEach(tc => this.SharedStepsInitialViewModel.ObservableTestCases.Add(tc));
                this.SharedStepsInitialViewModel.TestCasesCount = filteredTestCases.Count.ToString();

                progressBar.Visibility = System.Windows.Visibility.Hidden;
                mainGrid.Visibility    = System.Windows.Visibility.Visible;
            }, TaskScheduler.FromCurrentSynchronizationContext());
        }