用delphix显示图像是黑屏 ( 积分: 300 )

我用delphix显示图像，结是是黑屏，请问如何解决，谢谢！
代码如下：（其中imagelist1的图像已加载）
unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, DXDraws, DIB, StdCtrls,dxclass;

type
TForm1 = class(TDXForm)
DXImageList1: TDXImageList;
DXDraw1: TDXDraw;
Button1: TButton;
DXTimer1: TDXTimer;
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure DXTimer1Timer(Sender: TObject; LagCount: Integer);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin

DXDraw1.Initialize;

DXImageList1.Items.MakeColorTable;

DXDraw1.ColorTable :=DXImageList1.Items.ColorTable;
DXDraw1.DefColorTable :=DXImageList1.Items.ColorTable;
DXDraw1.UpdatePalette;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
if not DXDraw1.CanDraw then Exit;

//DXImageList1.Items[0].Width:=400;
//DXImageList1.Items[0].Height:=500;

DXImageList1.Items[0].Draw(DXDraw1.Surface,600,500,0);
DXDraw1.Flip;



end;

procedure TForm1.DXTimer1Timer(Sender: TObject; LagCount: Integer);
begin

DXDraw1.Surface.Fill(0);

if not DXDraw1.CanDraw then Exit;

DXImageList1.Items[0].DrawWaveX(DXDraw1.Surface, 50, 30, 320, 90, 0, 2, 80, 0);


DXImageList1.Items[0].Draw(DXDraw1.Surface,600,500,0);
DXDraw1.Flip;

end;

end.

没有用过这些控件，是不是控件引起的哦？

如果我没有记错，canvas用过要释放的
Release
DXDraw1.Surface.Canvas.Release;