Macbook Pro sound doesn't go to Display

When I plug in my Macbook Pro, with Lion (And when SL) my external mac monitor is active. My laptop is on its stand, closed.
The sound stays with the laptop.  I can go into the system prefs and change it to the monitor, but shouldn't it happen automaticly?
What am I missing?

Bigb78 2 wrote:
http://support.apple.com/downloads/#displays
Downloaded the latest update for audio stuff, but when I attempt to run the file, it says I don't need the update on this computer.  Downloading other display update... see what happens.
Look in Software Update to see if either is correct for your MBP.

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