HDMI out won't work???

Hello my fellow Crackberrians!!

Am I doing something wrong?

I thought I just plug it in to the TV using the same cable that I use for my PlayBook and it would just appear on my TV but it continues to play on the phone and not send the signal to the TV??

I'm running on AT&T versin 10.0.10.116

Swiped from the Links amazing Z10

My TV is a Samsung 50 inch Plasma that I've had for about 6 years