/// <summary>
 /// Remove a column.
 /// </summary>
 /// <param name="column">The column to remove.</param>
 public void removeColumn(EditablePropertyColumn column)
 {
     columns.Remove(column);
 }
 /// <summary>
 /// Add a column.
 /// </summary>
 /// <param name="column">The column to add.</param>
 public void addColumn(EditablePropertyColumn column)
 {
     columns.Add(column);
 }