CLRegion creation error in version

I just updated to v. and I get this message:

error CS1729: The type `U3DXT.iOS.Native.CoreLocation.CLRegion’ does not contain a constructor that takes 3 arguments

For this code that used to work:

CLRegion cornerStore = new CLRegion (myCoords, theRadius, myRegion);

Any guidance would be greatly appreciated. Thanks.

Use the derived class CLCircularRegion for this.

CLRegion cornerStore = new CLCircularRegion(myCoords, theRadius, myRegion);