void showGroupingGuestByNumOfPeople()
{
MgGuestRequestsList = new List <GuestRequest>();
foreach (var item in bL.GroupGuestRequestByNumOfGuests())
{
foreach (var value in item)
{
MgGuestRequestsList.Add(value);
}
}
this.ManagerZone.dataGrid.ItemsSource = MgGuestRequestsList;
}