new public void Insert(int link, LinkField val)
		{
			if (this._link != null) 
			{
				val.SetLink(this._link);
			}
			if ( this.Contains(val) ) 
			{
				this.Remove(val);
			}
			this.Insert(link, val);
		}
		public override int Add(LinkField val)
		{
			if (this._link != null) 
			{
				val.SetLink(this._link);
			}
			if ( !this.Contains(val) ) 
			{
				return base.Add(val);
			}
			return -1;
		}