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

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

var
  Form1: TForm1;
  Button: TButton;
  Memo: TMemo;
  Edit: TEdit;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
 Button:=TButton.Create(Self);
 with Button do
 begin
     Parent:=Form1;
     Caption:='Testen';
     Left:=100;
     Top:=100;
     OnClick:=Button1Click;
 end;
  Memo:=TMemo.Create(Self);
 with Memo do
 begin
     Parent:=Form1;
     Left:=100;
     Top:=200;
 end;
  Edit:=TEdit.Create(Self);
 with Edit do
 begin
     Parent:=Form1;
     Left:=100;
     Top:=350;
 end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  if Sender is TButton then
    Memo.text:=Edit.text;
end;