unit Unit1 interface uses Windows Messages SysUtils Variants Classes G

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Panel1: TPanel;

    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
      procedure OnButtonClick(Sender: TObject);
  end;

var
  Form1: TForm1;
  Button:TButton;
  ButtonList: TList;
implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  Button:=TButton.Create(form1);
  Button.parent:=panel1;
  Button.Visible:=True;
  Button.Caption:='+';
  Button.Left:= 100;
  Button.Top:= 20;
  Button.Width:=100;
  Button.Height:=100;
  Button.OnClick:=Form1.OnButtonClick;

end;

procedure TForm1.OnButtonClick(Sender: TObject);
begin
  if Sender is TButton then
    with (Sender as TButton) do
     panel1.Height:=panel1.Height*2;
end;


end.