public class LetterSpacingLabelRenderer : LabelRenderer
    {
        protected LetterSpacingLabel LetterSpacingLabel { get; private set; }

        protected override void OnElementChanged(ElementChangedEventArgs<Label> e)
        {
            base.OnElementChanged(e);

            if (e.OldElement == null)
            {
                this.LetterSpacingLabel = (LetterSpacingLabel)this.Element;
            }

            var letterSpacing = this.LetterSpacingLabel.LetterSpacing;
            this.Control.LetterSpacing = letterSpacing;

            this.UpdateLayout();
        }
    }