private void ResizeThumb_DragDelta(object sender, DragDeltaEventArgs e)
{
if (_designerItem != null)
{
var scaleTransform = _designerItem.GetTransform <ScaleTransform>();
var scaleX = scaleTransform.ScaleX;
var scaleY = scaleTransform.ScaleY;
var ha = scaleX == -1 ? HorizontalAlignment.Invert() : HorizontalAlignment;
var va = scaleY == -1 ? VerticalAlignment.Invert() : VerticalAlignment;
Resize(e, va, ha);
}
e.Handled = true;
}