How to select front / back camera using MobileImagePicker?

i made a small App which wants to make a picture of the user - by using the back(selfie) camera.
ImagePicker1.Source = MobileImagePicker.Sources.Camera

Is there no MobileImagePicker.Sources.Camera.FRONT or MobileImagePicker.Sources.Camera.BACK parameter?

I cant find any Option for which camera is used - so the MobileImagePicker always starts showing the front camera and the user must first switch to the rear7back camera before i can use the pic.

Any way to do this , perhaps by some Android declares or Android Design Extension?