Problem with 3 monitor configuration (2 monitors and a TV)

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http://askubuntu.com – Hello I've been seraching a lot in the web about my problem but I haven't been able to find a solution. I have an ATI RADEON HD 6870, I'm using Ubuntu 11.10 with Unity and AMD Catalyst 11.12,and I have 2 monitors Samsung S20A300BS connected by the DVI port and a LG TV 32LD450 connected by the HDMI port. The thing is that I want to use the 2 monitors for working and use the TV to watch movies and TV shows, I have the 2 monitors working perfectly together but I can't use the 3 screens at the same time, I've tried every possible configuration with AMD CCC but it doesn't let me use the TV (I op (HowTos)