Index: /OpenSceneGraph/trunk/src/osgWidget/Window.cpp
===================================================================
--- /OpenSceneGraph/trunk/src/osgWidget/Window.cpp (revision 10489)
+++ /OpenSceneGraph/trunk/src/osgWidget/Window.cpp (revision 10624)
@@ -115,4 +115,7 @@
         return false;
     }
+
+    if (_window.valid() && _parent)
+        unparented(_parent);
 
     _window = win;