It is so because they are part of the Aero feature.
Aero is more than just the transparency bit.
"PEK" <pekspro@home.se> wrote in message
news:EEBB7234-DBAA-4B83-93AB-03CB8E774921@microsoft.com...
>I prefer using Windows Classic theme instead of Aero, but then I lose some
>nice Aero-features like Flip 3d, the new alt-tab replacement and the
>"preview" of running applications you gets when you hold the mouse over an
>application in the task bar. Why is it so? Is there any solution for this?
>