internal void DeleteAnchor(Data.Anchor anchor)
{
anchor.IsSelected = false;
U.RemoveFromArray(ref Anchors, anchor);
KeysAndAnchors.Remove(anchor);
}
internal void AddAnchor(Data.Anchor anchor)
{
anchor.IsSelected = true;
U.AddToArray(ref Anchors, anchor);
KeysAndAnchors.Add(anchor);
}