MapLayer.Position Attached Property
Bing
The child element should not have its Width and Height properties defined, instead its HorizontalAlign and VerticalAlign should both be set to Stretch.
Assembly: Microsoft.Maps.MapControl.WPF (in Microsoft.Maps.MapControl.WPF.dll)
Property Value
Type: Microsoft.Maps.MapControl.WPF.LocationReturns Microsoft.Maps.MapControl.WPF.Location.
Show: