private void AlignVertically(VerticalAlignment alignment)
{
var aligner = new Aligner(DesignSurface.SelectedItems.Cast<ICanvasItem>().ToList());
aligner.AlignVertically(alignment);
}
private void AlignHorizontally(HorizontalAlignment alignment)
{
var aligner = new Aligner(DesignSurface.GetSelectedCanvasItems());
aligner.AlignHorizontally(alignment);
}