Allow guides in popup activities

Right now, I have a room with three screens, each with a separate STB. It would be great if I could set up a button (e.g., “Left Screen”) to call a Popup Activity that displayed the guide that controls that STB. When I close it, it would take me back to control my main screen.

In addition, with this functionality, a user could choose to put all of their guides on Popup Activities and have a bit more control control of the interface.