10. Platform abstractionSeparate UI and logic

12. Platform abstractionSeparate UI and logic

13. Platform abstractionSeparate UI and logicShare code

14. UI Application Logic General architectural approach

15. View ViewModel Model Databinds References Model-View-ViewModel (MVVM)

16. View ViewModel Model Platform specific Portable/Common

18. Platform abstractionSeparate UI and logicShare code

19. Platform abstractionSeparate UI and logicShare code

22. Platform abstractionSeparate UI and logicShare code