OnClick de um botao

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    SpeedButton1: TSpeedButton;
    procedure Button1Click(Sender: TObject);
    procedure SpeedButton1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
begin
  ShowMessage(Sender.ClassName);
end;

procedure TForm1.SpeedButton1Click(Sender: TObject);
begin
  Button1Click(Sender);
end;

end.