public override void OnEnable()
 {
     GlobalMaskList <ButtonEntity> .Add(this, Mask);
 }
 public override void OnDisable()
 {
     GlobalMaskList <ButtonEntity> .Remove(this, Mask);
 }
 /// <summary>
 /// The unmodifyable masked list of <see cref="GlobalMaskList{ButtonEntity} at <paramref name="index"/>"/>.
 /// </summary>
 public static IReadOnlyCollection <ButtonEntity> GetMaskedList(int index)
 {
     return(GlobalMaskList <ButtonEntity> .GetMaskedList(index));
 }