When I have a Admob Adview with this code:
<GoogleAds:AdView AdUnitID="ca-app-pub-xxxxxx"
Format="Banner"
ReceivedAd="AdView_ReceivedAd"
FailedToReceiveAd="AdView_FailedToReceiveAd"
VerticalAlignment="Bottom"
/>
But when I start my app in Landscape mode I get a white surrounding around my AdView. Sometimes the AdView fills the complete size, but some ads are too small like this: