I know if I click the 'B' button, it will display a small window of the last channel I selected. But what I'm really interested in is a preview of the channels from within the Guide view. For instance, if within the Guide view, I navigate to CNN, I'd like to see a preview of what's being shown on CNN. Likewise, if I then navigate to YTV from within the Guide view, I'd like to see a preview of what's being shown on YTV. Possible? If so, how?