private void MoveResizer(AttachmentDialogItem item, Rect resizerBounds)
{
// Transform resizer so it is anchored around the selected image.
if (resizer != null && item != null)
{
resizer.LimitBounds = GetScaledBounds(item.ResizeLimit);
resizer.Bounds = GetScaledBounds(resizerBounds);
resizer.InvalidateArrange();
}
}