procedure TForm1.DBGrid1DrawDataCell(Sender: TObject; const Rect: TRect;
  Field: TField; State: TGridDrawState);
begin
  // If the record's CustNo is 4711 draw the entire row with a
  // line through it. (set the font style to strike out)
  if (Sender as TDBGrid).DataSource.DataSet.FieldByName('CustNo').AsString = '1221' then
    with (Sender as TDBGrid).Canvas do
    begin
      FillRect(Rect);
      // Set the font style to StrikeOut
      Font.Style := Font.Style + [fsStrikeOut];
      Font.Color := clRed;
      // Draw the cell right aligned for floats + offset
      if (Field.DataType = ftFloat) then
        TextOut(Rect.Right-TextWidth(Field.AsString)-3, Rect.Top+3, Field.AsString)
      // Otherwise draw the cell left aligned + offset
      else
        TextOut(Rect.Left+2,Rect.Top+3,Field.AsString);
    end;
end;