12-01-2010 02:49 AM - edited 12-01-2010 02:50 AM
There is no way to turn it on from the STB, it doesn't work. Maybe your TV has that feature and you turned it on from the TV, check your manual.
Edit: Which STB brand do you have? Motorola or Cisco? I'm not sure if the new Cisco boxes have that feature, not many people have them yet.