https://devblogs.microsoft.com/xamarin/extending-xamarin-forms-controls-with-custom-renderers/
Extending Xamarin.Forms Controls with Custom Renderers - Xamarin Blog
Jun 22, 2015 - Xamarin.Forms allows you to build native UIs from a single, shared codebase with over 40 pages, layouts, and mix-and-match controls.
xamarin formscustom renderersextendingcontrolsblog