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unit MainForm;

interface

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

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

var
  Form1: TForm1;

implementation

{$R *.dfm}

Uses
  ThreadForm;

procedure TForm1.Button1Click(Sender: TObject);
begin
  TThreadTest.Create (False);
end;

end.                    

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unit ThreadForm;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls;

type
  TThreadTest = Class (TThread)
  Public
    Procedure Execute;  override;
  End;

  TForm2 = class(TForm)
    Image1: TImage;
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

implementation

{$R *.dfm}

Procedure TThreadTest.Execute;
Begin
  With TForm2.Create (nil) Do
    ShowModal;
End;

end.