App icon in Dock dims when it has a hidden window

I have learned that when you open a photo in Preview, for example, then hide the open Preview window using Command+H, the Preview icon on the Dock will dim to indicate the app has a hidden window. Snow Leopard does not seem to do this for me, but it does work on a friend's Mac. Is this a bug or a setting somewhere to turn this icon dim feature on? Anyone?
Thanks.

Does Apple document anywhere on its web site or otherwise what an App's hidden's features are that would have to be turned on/off with Terminal? I would be nice to know what other features we can do on the Mac that just aren't available in menus, etc., except in Terminal.

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