xamarin forms open URL with done

I used Device.OpenUri(uri) to open a URL in Xamarin.Forms. With this the user is taken to the default browser app. They are out of the context of the app and need to come back to the app. How do I open a browser where it is a pop up on the current view and has a done button which takes back to the app.
http://imgur.com/nZFYNyF