有谁知道怎么能在按钮上加ICO图片

以下是代码：
var
Form1: TForm1;
freeCanvas : TCanvas;
freeIcon : TIcon;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
freeCanvas := TCanvas.Create;
freeCanvas.Handle := getDC(button1.Handle);
freeIcon := TIcon.Create;
freeIcon.LoadFromFile('icon.ico'); //Your icon's path;
end;

procedure TForm1.FormPaint(Sender: TObject);
begin
button1.Refresh;
freeCanvas.Draw(0, 0, freeIcon);
end;