xfinity streaming app won't let me plug into a tv?

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http://androidforums.com – have a droid razr max thru vzw. at home wanted to watch star trek but not on my droid but on tv. when i plug in my hdmi cable from droid to tv, xfinity wants me to close the app. It gives me an option to make my tv a computer screen, where moving my finger on my phone's screen moves a pointer on the tv. VERY COOL. However, as cool as that is, it won't let me watch my movie from xfinity streaming from my phone on the tv. Is there some trick to doing this, or is xfinity really blocking me from doing this? thanks. (General)