/// <summary>
        /// Handler for selection change event.
        /// </summary>
        /// <param name="sender">The sender.</param>
        /// <param name="e">The <see cref="SelectionChangedEventArgs"/> instance containing the event data.</param>
        private void TestSelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (TestsTreeView.SelectedItems.Count == 1 && TestsTreeView.SelectedItems[0] is TestMethod)
            {
                var testMethod = TestsTreeView.SelectedItems[0] as TestMethod;
                TestResult = new TestResultsViewModel(testMethod.Name,
                                                      testMethod.ExecutionResult,
                                                      null);
            }
            else
            {
                dynamic groupedTests = Tests.SelectMany(t => t.TestMethods)
                                       .GroupBy(t => t.ExecutionResult.Status)
                                       .Select(t => new { Status = t.Key, Count = t.Count() })
                                       .Where(t => t.Count > 0);

                TestResult = new TestResultsViewModel("Summary", null, groupedTests);
            }
        }
		/// <summary>
		/// Handler for selection change event.
		/// </summary>
		/// <param name="sender">The sender.</param>
		/// <param name="e">The <see cref="SelectionChangedEventArgs"/> instance containing the event data.</param>
		private void TestSelectionChanged(object sender, SelectionChangedEventArgs e)
		{
			if (TestsTreeView.SelectedItems.Count == 1 && TestsTreeView.SelectedItems[0] is TestMethod)
			{
				var testMethod = TestsTreeView.SelectedItems[0] as TestMethod;
				TestResult = new TestResultsViewModel(testMethod.Name,
													  testMethod.ExecutionResult,
													  null);
			}
			else
			{
				dynamic groupedTests = Tests.SelectMany(t => t.TestMethods)
														  .GroupBy(t => t.ExecutionResult.Status)
														  .Select(t => new { Status = t.Key, Count = t.Count() })
														  .Where(t => t.Count > 0);

				TestResult = new TestResultsViewModel("Summary", null, groupedTests);
			}
		}