public bool Equals(IconKey other)
 {
     if (ReferenceEquals(null, other))
     {
         return(false);
     }
     if (ReferenceEquals(this, other))
     {
         return(true);
     }
     return(_back == other._back && _fore == other._fore &&
            _icon.CompareTo(other._icon) == 0 &&
            _size == other._size);
 }