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You can't. Only way to roll back is to do a complete reinstall of an earlier version of the entire OS.
 
RE: Uninstall 10.8.2...

Hi,

The easiest and best way to uninstall 10.8.2 is to go back to the last backup, say Time Machine or Carbon Copy Clone, you have before installing 10.8.2 and restore from it. This is simple and fairly painless.

Alternatively, if you don't have a recent backup just prior to 10.8.2, you might be able to go back to your InstallESD.dmg image for 10.8, assuming you made an 8GB USB 10.8 install thumb drive, and reinstall it on a clean system. Then update to 10.8.1 but not to 10.8.2 (find the 10.8.1 update on Apple's support website and not in the App Store).

Good luck,
Switon
 
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