/// <summary>
 /// Removes the specified xtra column.
 /// </summary>
 /// <param name="xtraColumn">The xtra column.</param>
 public void Remove(XtraColumn xtraColumn)
 {
     List.Remove(xtraColumn);
 }
 /// <summary>
 /// Adds the specified xtra column.
 /// </summary>
 /// <param name="xtraColumn">The xtra column.</param>
 public void Add(XtraColumn xtraColumn)
 {
     List.Add(xtraColumn);
 }