Summary
Provide a simple API for specifying the background color to use for the selected item in a ListView. Currently, this is only achievable through custom renderers for each platform.
API Changes
Add a new BindableProperty to ListView named "SelectedItemBackgroundColor".
Code
ListView lv = new ListView();
lv.SelectedItemBackgroundColor = Color.Blue;
XAML
<ListView SelectedItemBackgroundColor="Blue"/>
Intended Use Case
Changing the selected item background color seems like a common use case of a ListView. Each app has it's own visual style so changing this color to match your app's style seems like functionality that Xamarin.Forms should support natively.