delphi – 调用TsaveDialog时,我的详细信息表单隐藏在主窗体后面

procedure <DetailForm>.CreateParams(var Params: TCreateParams);
begin
  inherited CreateParams(Params);
  Params.ExStyle := Params.ExStyle or WS_EX_APPWINDOW;
  Params.WndParent:= GetDesktopWindow;  
end;

我使用delphi 2010并设置了Application.MainFormOnTaskbar：= True;
当我在Detailform中使用PromptForFileName或TSaveDialog时,DetailForm会在Mainform后面.
关闭对话框后,DetailForm返回.

当我使用DialogForm(具有属性PopupMode：pmAuto的TForm的Showmodal)时,我的DetailForm保持在主和对话之间.
如何强制TSaveDialog像一个showmodal与属性PopupMode：pmAuto或如何防止我的detailform落后于mainform

演示：

program Project1;

uses
  Forms,Unit1 in 'Unit1.pas' {Form1},Unit2 in 'Unit2.pas' {Form2};

  {$R *.res}

begin
  Application.Initialize;
  Application.MainFormOnTaskbar := True;
  Application.CreateForm(TForm1,Form1);
  Application.Run;
end.

unit Unit1;

interface

uses
  Windows,Messages,SysUtils,Variants,Classes,Graphics,Controls,Forms,Dialogs,StdCtrls,ImgList,ActnList;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

uses Unit2;

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  oForm: TForm;
begin
  oForm:= Unit2.TForm2.Create(Self);
  oForm.Show;
end;
end.

unit Unit2;

interface

uses
  Windows,StdCtrls;

type
  TForm2 = class(TForm)

    SaveDialog1: TSaveDialog;
    procedure cxButton1Click(Sender: TObject);
  private
  protected
    procedure CreateParams(var Params: TCreateParams); override;
        { Private declarations }

  public
    { Public declarations }
  end;

var
  Form2: TForm2;

implementation

{$R *.dfm}

{ TForm2 }

procedure TForm2.CreateParams(var Params: TCreateParams);
begin
  inherited CreateParams(Params);
  Params.ExStyle := Params.ExStyle or WS_EX_APPWINDOW;
  Params.WndParent:= 0;   // --> Testing
end;

procedure TForm2.cxButton1Click(Sender: TObject);
begin
  self.SaveDialog1.execute();
end;

end.