Xamarin custom button renderrer for buttons with FontImagesource

FontImageButtonRenderrer.WPF.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
using Xamarin.Forms.Platform.WPF;
using MyDemo.WPF.Renderers;

[assembly: ExportRenderer(typeof(Xamarin.Forms.Button), typeof(FontImageButtonRenderrer))]
namespace MyDemo.WPF.Renderers
{
    public class FontImageButtonRenderrer : ButtonRenderer
    {

        protected override void OnElementChanged(ElementChangedEventArgs<Button> e)
        {
            UpdateFontImageColor();
            base.OnElementChanged(e);
        }

        protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            if (e.PropertyName == Button.TextProperty.PropertyName || 
                e.PropertyName == Button.ImageSourceProperty.PropertyName || 
                e.PropertyName == Button.TextColorProperty.PropertyName)
            {
                UpdateFontImageColor();
            }
            base.OnElementPropertyChanged(sender, e);
        }

        private void UpdateFontImageColor()
        {
            if (Element.ImageSource != null && Element.ImageSource is FontImageSource)
            {
                ((FontImageSource)Element.ImageSource).Color = Element.TextColor == Color.Default ?
                    Color.FromRgba(System.Windows.SystemColors.WindowTextColor.R, 
                        System.Windows.SystemColors.WindowTextColor.G, 
                        System.Windows.SystemColors.WindowTextColor.B, 
                        System.Windows.SystemColors.WindowTextColor.A) :
                    Element.TextColor;
            }
        }

    }
}