[cxGrid] Change Multi-Selected Records

//0.Search Manual: TcxCustomDataController.ForEachRow

//1. set properties for multi-selection
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MainGridView.OptionsSelection.MultiSelect := true;
MainGridView.DataController.KeyFieldNames := 'SONo';
FSelectSONoList := TStringList.Create;
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//2.prepare a callback function to save what you would selected
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procedure TfrmSOSchedule.SaveSelectedSO(ARowIndex: Integer;
 ARowInfo: TcxRowInfo);
begin
 with MainGridView.DataController do
 begin
    //test whether a row is a data record
    if ARowInfo.Level = Groups.GroupingItemCount then
   FSelectSONoList.Add(String(GetRecordId(ARowInfo.RecordIndex)));
 end;
end;
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//3.use the selected entries
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procedure TfrmSOSchedule.btnUpdateSelectedSOClick(Sender: TObject);
var
 i: Integer;
begin
 FSelectSONoList.BeginUpdate;
 try
    FSelectSONoList.Clear;
    MainGridView.DataController.ForEachRow(true, SaveSelectedSO);
 finally
    FSelectSONoList.EndUpdate;
 end;

 with MainGridView.DataController.DataSource.DataSet do
 begin
    DisableControls;
    try
   for i := 0 to FSelectSONoList.Count - 1 do
   begin
     if Locate('SONo', FSelectSONoList[i], []) then
    FindField('status').AsInteger := 1;
   end;
    finally
   PostSaleOrders;
   EnableControls;
    end;
 end;
end;