diff --git a/include/osgViewer/api/Win32/GraphicsWindowWin32 b/include/osgViewer/api/Win32/GraphicsWindowWin32
index 927c6a236..e359bd940 100644
--- a/include/osgViewer/api/Win32/GraphicsWindowWin32
+++ b/include/osgViewer/api/Win32/GraphicsWindowWin32
@@ -106,6 +106,9 @@ class OSGVIEWER_EXPORT GraphicsWindowWin32 : public osgViewer::GraphicsWindow, p
     protected:
     
         void init();
+
+        void registerWindow();
+        void unregisterWindow();
         
         bool registerWindowProcedure();
         bool unregisterWindowProcedure();
diff --git a/src/osgViewer/GraphicsWindowWin32.cpp b/src/osgViewer/GraphicsWindowWin32.cpp
index 0c2f19722..160c9fc89 100644
--- a/src/osgViewer/GraphicsWindowWin32.cpp
+++ b/src/osgViewer/GraphicsWindowWin32.cpp
@@ -1334,6 +1334,16 @@ void GraphicsWindowWin32::destroyWindow( bool deleteNativeWindow )
     _destroying  = false;
 }
 
+void GraphicsWindowWin32::registerWindow()
+{
+  Win32WindowingSystem::getInterface()->registerWindow(_hwnd, this);
+}
+
+void GraphicsWindowWin32::unregisterWindow()
+{
+  Win32WindowingSystem::getInterface()->unregisterWindow(_hwnd);
+}
+
 bool GraphicsWindowWin32::registerWindowProcedure()
 {
     ::SetLastError(0);