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

            if (e.NewElement != null)
            {
                _formsView = (CircularProgressView)e.NewElement;
            }
        }
        private void StartProgress(CircularProgressView ve)
        {
            ve.Progress = 0f;

            Device.StartTimer(TimeSpan.FromMilliseconds(1), () => {
                ve.Progress += 0.005f;

                if (ve.Progress >= 1.0f) {
                    ve.Progress = 0f;
                }

                return true;
            });
        }