internal bool SafeForExport()
        {
            foreach (var item in CustomItems)
            {
                if (!item.SafeForExport())
                {
                    return(false);
                }
            }

            return(SelectedBy == null || SelectedBy.SafeForExport());
        }
        internal bool SafeForExport()
        {
            foreach (var column in Columns)
            {
                if (!column.SafeForExport())
                {
                    return(false);
                }
            }

            return(SelectedBy != null && SelectedBy.SafeForExport());
        }