[MonoTouch] Issue with MKMapView selected annotations

[Chris Bailey]

I am continuing to have an issue that I am wondering if anyone has an idea
about.  In my code, I would like to obtain the coordinates of the current
selected annotation from MKMapView.  To do this, I have attempted:

CLLocationCoordinate2D desiredlocation =
mapView.SelectedAnnotations.First().Coordinate;

With this code, everything compiles OK, however, I always get a cannot cast
from source to destination type error.

Unhandled Exception: System.InvalidCastException: Cannot cast from source
type to destination type.
  at (wrapper managed-to-native)
object:__icall_wrapper_mono_object_castclass (object,intptr)
  at MonoTouch.Foundation.NSArray.ArrayFromHandle[MKAnnotation] (IntPtr
handle) [0x00000]
  at MonoTouch.MapKit.MKMapView.get_SelectedAnnotations () [0x00000]
  at
Martini.AppDelegate+MapViewDelegate+<GetViewForAnnotation>c__AnonStorey1.<>m__6
(System.Object , System.EventArgs ) [0x00000]
  at MonoTouch.UIKit.UIControlEventProxy.Activated () [0x00000]
  at (wrapper managed-to-native)
MonoTouch.UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
  at MonoTouch.UIKit.UIApplication.Main (System.String[] args, System.String
principalClassName, System.String delegateClassName) [0x00000]
  at MonoTouch.UIKit.UIApplication.Main (System.String[] args) [0x00000]
  at Martini.Application.Main (System.String[] args) [0x00000]

Does anyone have an idea how to accomplish what I am desiring?

Monotouch 1.2 with latest MonoDevelop.

Thanks!
Chris
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