tmass, your x4000 has Pandora built-in. Why not use that instead of the one on your TV?
On your x4000 remote, press the "NETWORK" button. It will show, (on your TV screen), a list of network applications, including Pandora. Select Pandora, enter your login info, and listen. Easy Peasy. I use it all the time.
While listening to Pandora, you can easily change your TV to display the Pandora screen, or a TV channel, by using the "OPTION" button.
Then to return to TV mode, press "CBL/SAT" on your x4000 remote... or "Blu-ray", or whatever you want.
My TV and Bluray player also have Pandora... but I find more flexibility using the one in the x4000. For that reason, I have the x4000 hardwired w/ an ethernet cable, while all other components are connected via wireless access point. I feel the hardwire just gives me a little more stability.