private async Task UpdateEyedropperWorkAreaAsync()
        {
            if (TargetElement != null)
            {
                UIElement content;
                if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)
                {
                    content = XamlRoot.Content;
                }
                else
                {
                    content = Window.Current.Content;
                }

                var transform = TargetElement.TransformToVisual(content);
                var position  = transform.TransformPoint(default(Point));
                _eyedropper.WorkArea = new Rect(position, new Size(TargetElement.ActualWidth, TargetElement.ActualHeight));
                if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)
                {
                    _eyedropper.XamlRoot = XamlRoot;
                }

                await _eyedropper.UpdateAppScreenshotAsync();
            }
        }
 private async void UpdateEyedropperWorkArea()
 {
     if (TargetElement != null)
     {
         var transform = TargetElement.TransformToVisual(Window.Current.Content);
         var position  = transform.TransformPoint(default(Point));
         _eyedropper.WorkArea = new Rect(position, new Size(TargetElement.ActualWidth, TargetElement.ActualHeight));
         await _eyedropper.UpdateAppScreenshotAsync();
     }
 }