Index: Ringtoets/Demo/src/Ringtoets.Demo/Commands/AddNewDemoDuneAssessmentSectionCommand.cs
===================================================================
diff -u -rd121feba5299c86d7ac04a366ee869b163e43ec7 -r2b1937d120d50436169ef18d9fce57d4400d1bbe
--- Ringtoets/Demo/src/Ringtoets.Demo/Commands/AddNewDemoDuneAssessmentSectionCommand.cs	(.../AddNewDemoDuneAssessmentSectionCommand.cs)	(revision d121feba5299c86d7ac04a366ee869b163e43ec7)
+++ Ringtoets/Demo/src/Ringtoets.Demo/Commands/AddNewDemoDuneAssessmentSectionCommand.cs	(.../AddNewDemoDuneAssessmentSectionCommand.cs)	(revision 2b1937d120d50436169ef18d9fce57d4400d1bbe)
@@ -7,21 +7,17 @@
     /// <summary>
     /// Command that adds a new <see cref="DuneAssessmentSection"/> with demo data to the project tree.
     /// </summary>
-    public class AddNewDemoDuneAssessmentSectionCommand : IGuiCommand
+    public class AddNewDemoDuneAssessmentSectionCommand : GuiCommand
     {
-        public bool Enabled
+        public override bool Enabled
         {
             get
             {
                 return true;
             }
         }
 
-        public bool Checked { get; set; }
-
-        public IGui Gui { get; set; }
-
-        public void Execute(params object[] arguments)
+        protected override void OnExecute(params object[] arguments)
         {
             var project = Gui.Project;
             project.Items.Add(CreateNewDemoAssessmentSection());