Xamarin Picker with ID-based Binding

You have a record that has id "keys" associated with a lookup table or other key/value basis. A standard picker will not show the value when a record is retrieved for display and the picker has an ItemsSource based on some key/value pair source. My ComboPicker class will show the proper value based on the bound ID, such as when a record is retrieved from database. This combo picker offers additional functionality too.