public class SalesRows
{
 #region Private Fields
 private BindingList<SalesRow> salesRows;
 #endregion

 #region Constructors
 public SalesRows(BindingList<SalesRow> salesRows)
 {
  if (salesRows == null)
  {
   throw new ArgumentNullException();
  }

  this.salesRows = salesRows;
 }
 #endregion

 #region Public Properties
 public BindingList<SalesRow> Rows
 {
  get
  {
   BindingList<SalesRow> rows = new BindingList<SalesRow>();

   GlobalSalesRow globalSalesRow = new GlobalSalesRow("GLOBAL", this.salesRows);

   foreach (SalesRow salesRow in this.salesRows)
   {
    rows.Add(salesRow);
   }
   rows.Add(globalSalesRow);

   return rows;
  }
 }
 #endregion
}