Index: Ringtoets/Common/src/Ringtoets.Common.Forms/Views/FailureMechanismSectionsView.cs
===================================================================
diff -u -rc7765a155d2a99d3805285129b8253dd7e7516c5 -r29a27b4ad6d4b3569a9a28b6e9f1392f93fe2149
--- Ringtoets/Common/src/Ringtoets.Common.Forms/Views/FailureMechanismSectionsView.cs	(.../FailureMechanismSectionsView.cs)	(revision c7765a155d2a99d3805285129b8253dd7e7516c5)
+++ Ringtoets/Common/src/Ringtoets.Common.Forms/Views/FailureMechanismSectionsView.cs	(.../FailureMechanismSectionsView.cs)	(revision 29a27b4ad6d4b3569a9a28b6e9f1392f93fe2149)
@@ -39,7 +39,7 @@
 
         private readonly Observer failureMechanismObserver;
 
-        private List<FailureMechanismSection> currentSections;
+        private IEnumerable<FailureMechanismSection> currentSections;
 
         /// <summary>
         /// Creates a new instance of <see cref="FailureMechanismSectionsView"/>.
@@ -88,7 +88,7 @@
         {
             base.OnLoad(e);
 
-            currentSections = sections.ToList();
+            currentSections = sections.ToArray();
 
             SetDataGridViewControlData();
         }
@@ -120,7 +120,7 @@
                 return;
             }
 
-            currentSections = sections.ToList();
+            currentSections = sections.ToArray();
 
             SetDataGridViewControlData();
         }
Index: Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Views/FailureMechanismSectionsProbabilityAssessmentViewTest.cs
===================================================================
diff -u -r303f338bc9e42d1d7621666fdf83b93a11f28b64 -r29a27b4ad6d4b3569a9a28b6e9f1392f93fe2149
--- Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Views/FailureMechanismSectionsProbabilityAssessmentViewTest.cs	(.../FailureMechanismSectionsProbabilityAssessmentViewTest.cs)	(revision 303f338bc9e42d1d7621666fdf83b93a11f28b64)
+++ Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Views/FailureMechanismSectionsProbabilityAssessmentViewTest.cs	(.../FailureMechanismSectionsProbabilityAssessmentViewTest.cs)	(revision 29a27b4ad6d4b3569a9a28b6e9f1392f93fe2149)
@@ -216,9 +216,9 @@
             {
                 DataGridView sectionsDataGridView = GetSectionsDataGridView(view);
 
-                var count = 0;
+                var dataSourceChanged = false;
 
-                sectionsDataGridView.DataSourceChanged += (s, e) => { count++; };
+                sectionsDataGridView.DataSourceChanged += (s, e) => { dataSourceChanged = true; };
 
                 DataGridViewControl sectionsDataGridViewControl = GetSectionsDataGridViewControl(view);
 
@@ -230,7 +230,7 @@
                 failureMechanism.NotifyObservers();
 
                 // Then
-                Assert.AreEqual(0, count);
+                Assert.IsFalse(dataSourceChanged);
                 AssertSectionsDataGridViewControl(failureMechanism.Sections.ToArray(), probabilityAssessmentInput, sectionsDataGridViewControl);
             }
         }
@@ -250,16 +250,15 @@
             {
                 DataGridView sectionsDataGridView = GetSectionsDataGridView(view);
 
-                var count = 0;
+                var invalidated = false;
 
-                sectionsDataGridView.Invalidated += (s, e) => { count++; };
+                sectionsDataGridView.Invalidated += (s, e) => { invalidated = true; };
 
                 // When
-                failureMechanism.Contribution = 50;
                 failureMechanism.NotifyObservers();
 
                 // Then
-                Assert.AreEqual(0, count);
+                Assert.IsFalse(invalidated);
             }
         }
 
Index: Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Views/FailureMechanismSectionsViewTest.cs
===================================================================
diff -u -rfdfadac14aca46b2ffde145e6532ee7bb18d2507 -r29a27b4ad6d4b3569a9a28b6e9f1392f93fe2149
--- Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Views/FailureMechanismSectionsViewTest.cs	(.../FailureMechanismSectionsViewTest.cs)	(revision fdfadac14aca46b2ffde145e6532ee7bb18d2507)
+++ Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Views/FailureMechanismSectionsViewTest.cs	(.../FailureMechanismSectionsViewTest.cs)	(revision 29a27b4ad6d4b3569a9a28b6e9f1392f93fe2149)
@@ -201,15 +201,15 @@
             {
                 DataGridView sectionsDataGridView = GetSectionsDataGridView(view);
 
-                var count = 0;
+                var invalidated = false;
 
-                sectionsDataGridView.Invalidated += (s, e) => { count++; };
+                sectionsDataGridView.Invalidated += (s, e) => { invalidated = true; };
 
                 // When
                 failureMechanism.NotifyObservers();
 
                 // Then
-                Assert.AreEqual(0, count);
+                Assert.IsFalse(invalidated);
             }
         }