Index: Ringtoets/Demo/src/Ringtoets.Demo/Commands/AddNewDemoDuneAssessmentSectionCommand.cs
===================================================================
diff -u -r2b1937d120d50436169ef18d9fce57d4400d1bbe -re8aaaf3808e54e4f075eab6f6c58bedf35e0890e
--- Ringtoets/Demo/src/Ringtoets.Demo/Commands/AddNewDemoDuneAssessmentSectionCommand.cs	(.../AddNewDemoDuneAssessmentSectionCommand.cs)	(revision 2b1937d120d50436169ef18d9fce57d4400d1bbe)
+++ Ringtoets/Demo/src/Ringtoets.Demo/Commands/AddNewDemoDuneAssessmentSectionCommand.cs	(.../AddNewDemoDuneAssessmentSectionCommand.cs)	(revision e8aaaf3808e54e4f075eab6f6c58bedf35e0890e)
@@ -17,8 +17,16 @@
             }
         }
 
-        protected override void OnExecute(params object[] arguments)
+        public override bool Checked
         {
+            get
+            {
+                return false;
+            }
+        }
+
+        public override void Execute(params object[] arguments)
+        {
             var project = Gui.Project;
             project.Items.Add(CreateNewDemoAssessmentSection());
             project.NotifyObservers();