Shane McMahon has never been afraid to knock on doors. When he was just 5, his dad -- wrestling impresario and WWE Chairman Vince McMahon -- put him to work going from barber shop to barber shop asking if he could hang up fliers and posters for upcoming matches. Years later, McMahon was still selling for his dad. Only this time around the doors he was knocking on were in Eastern Europe and China. As the WWE's executive vice president of global media, the younger McMahon was instrumental in getting WWE content and events in almost 150 countries. Now McMahon, 41, is trying to do for Hollywood what he did for the WWE. Earlier this week his company You on Demand formed a partnership with Warner Bros. to get the entertainment giant's content into China via pay-per-view and video-on-demand cable platforms. You on Demand has access to homes in China through a 20-year pact with China Home Cinema, the pay-television arm of that country's CCTV-6 network. Cable operators can deliv