diff --git a/src/src/Rendering/Core/DraggableActor.h b/src/src/Rendering/Core/DraggableActor.h
index ef9b707..1338830 100644
--- a/src/src/Rendering/Core/DraggableActor.h
+++ b/src/src/Rendering/Core/DraggableActor.h
@@ -42,6 +42,7 @@ public:
         DragEndEvent,
         SelectedEvent,
         UnSelectedEvent,
+        MeasureChangedEvent
     };
 
     virtual void SetRenderer(vtkRenderer *ren);