diff --git a/src/src/measure/ActorDraggableInteractorStyle.cpp b/src/src/measure/ActorDraggableInteractorStyle.cpp
index 41893b4..628c568 100644
--- a/src/src/measure/ActorDraggableInteractorStyle.cpp
+++ b/src/src/measure/ActorDraggableInteractorStyle.cpp
@@ -323,6 +323,7 @@ void ActorDraggableInteractorStyle::WindowLevel()
 
 void ActorDraggableInteractorStyle::OnRightButtonDown()
 {
+    this->InvokeEvent(AfterViewerClicked);
 	int x = this->Interactor->GetEventPosition()[0];
 	int y = this->Interactor->GetEventPosition()[1];
 
@@ -338,6 +339,7 @@ void ActorDraggableInteractorStyle::OnRightButtonDown()
 	}
 }
 void ActorDraggableInteractorStyle::OnLeftButtonDown() {
+    this->InvokeEvent(AfterViewerClicked);
 	int x = this->Interactor->GetEventPosition()[0];
 	int y = this->Interactor->GetEventPosition()[1];
 
diff --git a/src/src/measure/ActorDraggableInteractorStyle.h b/src/src/measure/ActorDraggableInteractorStyle.h
index 46bfc6f..6979d61 100644
--- a/src/src/measure/ActorDraggableInteractorStyle.h
+++ b/src/src/measure/ActorDraggableInteractorStyle.h
@@ -44,7 +44,8 @@ public:
 		DeleteMeasureEvent,
 		RightButtonClickEvent,
 		ScalarOpacityEvent,
-		ScalarShiftEvent
+		ScalarShiftEvent,
+		AfterViewerClicked
 	};
 
 	/**