A99 Soft Video Note~

I finally decided to try out some video with the A99 last night.  However, I could not make this work.  I switched the main top dial to video mode.  If I hit the Fn button (under the joystick) no  option appears to select aperture priority or manual.  If I hit the command button on the front of the camera, I can get an option to use either Tv or Av mode, but when I select Av, a message comes up saying that is not allowed in this mode.

Can you describe the procedure a little more?

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Steve W weather photos: http://home.comcast.net/~scwest/atmo/