Added using Callback::run() method to Drawable::CullCallback

git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14249 16af8721-9629-0410-8352-f15c8da7e697

include/osg/Drawable

@@ -307,6 +307,9 @@ class OSG_EXPORT Drawable : public Node
 
             META_Object(osg,CullCallback);
 
+            // just use the standard run implementation to passes run onto any nested callbacks.
+            using Callback::run;
+
             /** deprecated.*/
             virtual bool cull(osg::NodeVisitor*, osg::Drawable*, osg::State*) const { return false; }