Added a realize callback for setting up the pbuffer so that it definately has a valid graphics context.
Added a realize callback for setting up the pbuffer so that it definately
has a valid graphics context.


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