How to change Selected Tab icon using Xamarin Forms Android - xamarin.android

I have been trying for the last day to do something simple.
I have a Xamarin Forms app. I need to change the selected tab icon on Android.
I've tried custom renderers, but can't get anything to work.
Does anyone have a recipe or code to do this?
Thank you very much in advance.
Karl

James M wrote up a solution here
Thak you James M!

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