public virtual Column Build()
{
//if (title == null || type == null || index == null)
//{
// throw new MemberAccessException("A title, type, and index must be set.");
//}
Column column = new Column();
column.title = title;
column.type = type;
column.options = options;
column.symbol = symbol;
column.width = width;
column.systemColumnType = systemColumnType;
column.autoNumberFormat = autoNumberFormat;
column.primary = primary;
return column;
}