Well... honestly I'm not sure but I'm guessing it's standard on 08 models.

It was some sort of surprise feature. My dealer even didn't know what that was. He looked up the manual and told me how to use it.

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2008 X5 4.8i Black Sapphire/Black perforated int./Dark Bamboo wood trim, [w/ all factory options except rear DVD system]
+ aerodynamic kit/stainless pedals/illuminated door strip/3M Color-Stable tint/LED license plate light/Thule's 91726 snowboard carrier.
2006 X5 4.4i, Titanium Silver/Black int./Anthricite Maple(traded)