There is no need to do this. Set up your choices page so that the MAIN button goes to it. Then, when ever you wish to change sources, all you need to do is press the MAIN burron. It works flawlessly. Another page you will want to add to that section is a START page which turns on the TV and your Surround Receiver. These two devices generally take a while to come up (where tehy will accept additional commands). On my START pages, I turn on everything. Then the macro jumps to the CHOICES page. The choices page needs to be the one on top (first in order) so that the MAIN button will go to it.
This config makes the remote very user friendly. Write me directly and I will send you a copy of my most recent config file.