diff --git a/include/osgProducer/Viewer b/include/osgProducer/Viewer
index 6148ae7c8..7b9a7980c 100644
--- a/include/osgProducer/Viewer
+++ b/include/osgProducer/Viewer
@@ -113,8 +113,8 @@ class OSGPRODUCER_EXPORT Viewer : public OsgCameraGroup, public osgGA::GUIAction
         /** Dispatch the cull and draw for each of the Camera's for this frame.*/
         virtual void frame();
 
-        virtual void requestRedraw() {}
-        virtual void requestContinuousUpdate(bool) {}
+        virtual void requestRedraw();
+        virtual void requestContinuousUpdate(bool);
         virtual void requestWarpPointer(float x,float y);
 
 
diff --git a/src/osgProducer/Viewer.cpp b/src/osgProducer/Viewer.cpp
index 9b4e75089..6e819a26f 100644
--- a/src/osgProducer/Viewer.cpp
+++ b/src/osgProducer/Viewer.cpp
@@ -824,6 +824,16 @@ void Viewer::selectCameraManipulator(unsigned int no)
     if (_keyswitchManipulator.valid()) _keyswitchManipulator->selectMatrixManipulator(no);
 }
 
+void Viewer::requestRedraw()
+{
+    osg::notify(osg::INFO)<<"Viewer::requestRedraw() called"<<std::endl;
+}
+
+void Viewer::requestContinuousUpdate(bool flag)
+{
+    osg::notify(osg::INFO)<<"Viewer::requestContinuousUpdate("<<flag<<") called"<<std::endl;
+}
+
 void Viewer::requestWarpPointer(float x,float y)
 {
     if (_kbmcb.valid())