自定义procedure问题

Question

请问我想再窗口中自定义procedure应该在哪里定义，要注意那些方面
最好是有文档或例子

Answer 1

private 
  procedure aaa;.....
procedure TForm1.aaa;
begin
end;

Answer 2

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure showmsg123(str:string);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;var
  Form1: TForm1;implementation{$R *.dfm}procedure Tform1.showmsg123(str:string);
begin
showmessage(str);
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
showmsg123('你现在明白了吗？');
end;