protected override void OnElementChanged(ElementChangedEventArgs <Switch> e)
        {
            base.OnElementChanged(e);
            if (this.Control != null)
            {
                if (e.NewElement != null)
                {
                    switchControl = Control as UISwitch;
                    ctrl          = (CoreSwitch)e.NewElement;
                    trueColor     = ctrl.TrueColor;
                    falseColor    = ctrl.FalseColor;

                    switchControl.TintColor = UIColor.FromRGBA((nfloat)falseColor.R,
                                                               (nfloat)falseColor.G,
                                                               (nfloat)falseColor.B,
                                                               0.50f);
                    // see example code for caveat about changing background colour...

                    switchControl.OnTintColor = UIColor.FromRGBA((nfloat)trueColor.R,
                                                                 (nfloat)trueColor.G,
                                                                 (nfloat)trueColor.B,
                                                                 0.50f);


                    SetThumbTint();
                }
            }
        }
        protected override void OnElementChanged(ElementChangedEventArgs <Switch> e)
        {
            base.OnElementChanged(e);

            if (this.Control != null)
            {
                ctrl       = (CoreSwitch)e.NewElement;
                trueColor  = ctrl.TrueColor;
                falseColor = ctrl.FalseColor;

                if (this.Control.Checked)
                {
                    this.Control.TrackDrawable.SetColorFilter(trueColor.ToAndroid(), PorterDuff.Mode.Multiply);
                    this.Control.ThumbDrawable.SetColorFilter(trueColor.ToAndroid(), PorterDuff.Mode.Multiply);
                }
                else
                {
                    this.Control.TrackDrawable.SetColorFilter(falseColor.ToAndroid(), PorterDuff.Mode.Multiply);
                    this.Control.ThumbDrawable.SetColorFilter(falseColor.ToAndroid(), PorterDuff.Mode.Multiply);
                }

                //this.Control.CheckedChange += this.OnCheckedChange;
            }
        }