Index: Riskeer/DuneErosion/src/Riskeer.DuneErosion.Forms/PropertyClasses/DuneLocationCalculationsForUserDefinedTargetProbabilityProperties.cs
===================================================================
diff -u -rdf47a6dbc3520e78fac96dcd09b871ec0b417277 -raf8cee0fb958d02c42f9eb2727e14fdad40b5080
--- Riskeer/DuneErosion/src/Riskeer.DuneErosion.Forms/PropertyClasses/DuneLocationCalculationsForUserDefinedTargetProbabilityProperties.cs	(.../DuneLocationCalculationsForUserDefinedTargetProbabilityProperties.cs)	(revision df47a6dbc3520e78fac96dcd09b871ec0b417277)
+++ Riskeer/DuneErosion/src/Riskeer.DuneErosion.Forms/PropertyClasses/DuneLocationCalculationsForUserDefinedTargetProbabilityProperties.cs	(.../DuneLocationCalculationsForUserDefinedTargetProbabilityProperties.cs)	(revision af8cee0fb958d02c42f9eb2727e14fdad40b5080)
@@ -108,11 +108,18 @@
 
         public void Dispose()
         {
-            calculationsObserver.Dispose();
-
+            Dispose(true);
             GC.SuppressFinalize(this);
         }
 
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                calculationsObserver.Dispose();
+            }
+        }
+
         private DuneLocationCalculationProperties[] GetDuneLocationCalculationProperties()
         {
             return data.DuneLocationCalculations.Select(calculation => new DuneLocationCalculationProperties(calculation)).ToArray();