new public void Insert(int index, IndexOrderField val) {
if (this._index != null) {
val.SetIndex(this._index);
}
if ( this.Contains(val) ) {
this.Remove(val);
}
this.Insert(index, val);
}
new public int Add(IndexOrderField val) {
if (this._index != null) {
val.SetIndex(this._index);
}
if ( !this.Contains(val) ) {
return base.Add(val);
}
return -1;
}