That's the way its designed. There's no camera in the front, so you'll get warnings from the front sensors but no view. The cameras are on the bottom of each side mirror and on the rear license plate frame.
2008 E90 M3 - Dinan Stage 3 and BBS CH's
2000 328i sedan (UUC suspension - still the favorite)
2012 Mini Cooper (wife's)
1991 325iX (sold - gone but not forgotten!)
2011 X3 (Performance Center delivery done May '11)