Fixed nested callback calling.
Fixed nested callback calling.


git-svn-id: aa838dfc23441284dd616281de4245daec5d2135@14264 16af8721-9629-0410-8352-f15c8da7e697

XiaoCC/osg,koshman86/osg,omega-hub/osg,ntoand/osg,ghub/osg,XiaoCC/osg,omega-hub/osg,artoolkit/osg,ntoand/osg,koshman86/osg,ghub/osg,XiaoCC/osg,omega-hub/osg,ghub/osg,omega-hub/osg,artoolkit/osg,artoolkit/osg,ghub/osg,koshman86/osg,ntoand/osg,XiaoCC/osg,artoolkit/osg,ntoand/osg,XiaoCC/osg,koshman86/osg