how to change button properties with custom renderer class - android platform

Hi

i create new button 'NewButtonRenderer '
- [assembly: ExportRenderer(typeof(NewButton), typeof(NewButtonRenderer ))]
- public class NewButtonRenderer : ButtonRenderer
- protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.Button> e)

i want to set background ,text color , border color and width properties to new button 'NewButton' in android platform