How can I customize the color in switch?

I'm using xamarin.Forms and want to customize the color of the switch? I found on forum to customize the switch but it seems to be not working.
Below is the code :
[assembly: ExportRenderer(typeof(Xamarin.Forms.Switch), typeof(CustomSwitchRenderer))]
namespace EVGMobileSolution.Droid.Custom_Renderer
{
public class CustomSwitchRenderer : SwitchRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.Switch> e)
{
base.OnElementChanged(e);

        if (Control != null)
        {
            //Control.TextOn = "Si";
            //Control.TextOff = "No";
            Android.Graphics.Color colorOn = Android.Graphics.Color.Maroon;
            Android.Graphics.Color colorOff = Android.Graphics.Color.LightGray;
            Android.Graphics.Color colorDisabled = Android.Graphics.Color.Gray;

            StateListDrawable drawable = new StateListDrawable();
            drawable.AddState(new int[] { Android.Resource.Attribute.StateChecked }, new ColorDrawable(colorOn));
            drawable.AddState(new int[] { Android.Resource.Attribute.StateEnabled }, new ColorDrawable(colorDisabled));
            drawable.AddState(new int[] { }, new ColorDrawable(colorOff));

            Control.ThumbDrawable = drawable;
        }
    }

}

Can anybody let me know what I'm missing here.