Index: Demo/Ringtoets/src/Demo.Ringtoets/Commands/AddNewDemoAssessmentSectionCommand.cs
===================================================================
diff -u -r01af2589fd96232cd78a1ba09dc4fc9681e4b9ff -r4bd3e9f485f28038de9473e056f26555021cafcf
--- Demo/Ringtoets/src/Demo.Ringtoets/Commands/AddNewDemoAssessmentSectionCommand.cs	(.../AddNewDemoAssessmentSectionCommand.cs)	(revision 01af2589fd96232cd78a1ba09dc4fc9681e4b9ff)
+++ Demo/Ringtoets/src/Demo.Ringtoets/Commands/AddNewDemoAssessmentSectionCommand.cs	(.../AddNewDemoAssessmentSectionCommand.cs)	(revision 4bd3e9f485f28038de9473e056f26555021cafcf)
@@ -52,7 +52,7 @@
 
         public void Execute(params object[] arguments)
         {
-            var project = projectOwner.Project;
+            var project = (RingtoetsProject) projectOwner.Project;
             project.Items.Add(CreateNewDemoAssessmentSection());
             project.NotifyObservers();
         }