TDBGrid onSelect

implementation

{$R *.dfm}

type
  THackDBGrid = class(TDBGrid);
//for info on why we must do this, see:
//http://delphi.about.com/od/oopindelphi/l/aa082603a.htm

var
  LastValidRow: integer;

procedure TForm1.DataSource1DataChange(Sender: TObject; Field: TField);
begin
  //assign this to the TDBGrid.DataSource.DataSet.OnDataChange Event
  if 0 <> HiWord(GetKeyState(VK_LBUTTON)) then begin
    THackDBGrid(DBGrid1).Row := LastValidRow;
  end
  else begin
    LastValidRow := THackDBGrid(DBGrid1).Row;
    inherited;
  end;
end;