How to display an image in the cell of tdrawgrid-reply to the question "Yunfeng"

Problem Source: http://www.cnblogs.com/del/archive/2008/03/06/1094289.html#2023057
In C: \ temp \, prepare three images: 1.bmp, 2.bmp, 3.bmp, and then:

unit Unit1;interfaceuses  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,  Dialogs, Grids;type  TForm1 = class(TForm)    DrawGrid1: TDrawGrid;    procedure FormCreate(Sender: TObject);    procedure DrawGrid1DrawCell(Sender: TObject; ACol, ARow: Integer; Rect: TRect; State: TGridDrawState);    procedure FormDestroy(Sender: TObject);  end;var  Form1: TForm1;implementation{$R *.dfm}var  bits: array[0..2] of TBitmap;procedure TForm1.FormCreate(Sender: TObject);var  i: Integer;begin  ChDir('c:\Temp\');  for i := Low(bits) to High(bits) do  begin    bits[i] := TBitmap.Create;    bits[i].LoadFromFile(IntToStr(i+1) + '.bmp');  end;  DrawGrid1.FixedRows := 0;  DrawGrid1.FixedCols := 0;  DrawGrid1.RowCount := 1;  DrawGrid1.ColCount := 3;  DrawGrid1.DefaultRowHeight := bits[0].Height;  DrawGrid1.DefaultColWidth := bits[0].Width;end;procedure TForm1.DrawGrid1DrawCell(Sender: TObject; ACol, ARow: Integer; Rect: TRect; State: TGridDrawState);var  r: TRect;begin  if (ARow = 0) and (ACol >= Low(bits)) and (ACol