public FloatingHint CreateFloatingHint()
 {
     FloatingHint hint = new FloatingHint(this) { Hidden = true};
     _Hints.Add(hint);
     return hint;
 }
 public FloatingHint CreateFloatingHint(string text, double x, double y)
 {
     FloatingHint hint = new FloatingHint(this) { Text = text, X = x, Y = y };
     _Hints.Add(hint);
     return hint;
 }