Picker Binding No Longer Works As Illustrated

[dshontz]

On page 540 there is a section on how one could construct a bindable picker by binding to the Picker SelectedIndex property. This is no longer supported, at least with Xamarin templates 1.0.204 and Xamarin version 4.10.10.2. David Britch and Craig Dunn have a sample bindable picker that works differently, using the picker as the source and binding to the label text as a target.