Index: Ringtoets/Integration/src/Ringtoets.Integration.Forms/Views/AssemblyResultPerSectionView.cs
===================================================================
diff -u -r407e8e07eed3bf16bac838855a7fdfdfd39f22ac -r034ebb0408dfbf2a816c9042632a53b492143e1a
--- Ringtoets/Integration/src/Ringtoets.Integration.Forms/Views/AssemblyResultPerSectionView.cs	(.../AssemblyResultPerSectionView.cs)	(revision 407e8e07eed3bf16bac838855a7fdfdfd39f22ac)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Forms/Views/AssemblyResultPerSectionView.cs	(.../AssemblyResultPerSectionView.cs)	(revision 034ebb0408dfbf2a816c9042632a53b492143e1a)
@@ -50,7 +50,6 @@
     /// </summary>
     public partial class AssemblyResultPerSectionView : UserControl, IView
     {
-        private readonly Observer assessmentSectionObserver;
         private readonly Observer assessmentSectionResultObserver;
 
         /// <summary>
@@ -69,10 +68,6 @@
             AssessmentSection = assessmentSection;
             InitializeComponent();
 
-            assessmentSectionObserver = new Observer(EnableRefreshButton)
-            {
-                Observable = assessmentSection
-            };
             assessmentSectionResultObserver = new Observer(EnableRefreshButton)
             {
                 Observable = new AssessmentSectionResultObserver(assessmentSection)
@@ -97,10 +92,11 @@
 
         protected override void Dispose(bool disposing)
         {
+            dataGridViewControl.CellFormatting -= HandleCellStyling;
+
             if (disposing)
             {
                 components?.Dispose();
-                assessmentSectionObserver.Dispose();
                 assessmentSectionResultObserver.Dispose();
             }