If this isn't sufficient, you'll need to create a custom renderer and set up the styling on the native side of things using your own custom Xamarin.Android/Xamairn.iOS logic. We have three custom renderer articles on the documentation to get you started (here's the Android article).
Lance | Tech Support Engineer, Sr.
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items