unit Unit1;interfaceuses  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,  Dialogs, Menus, StdCtrls;type  TForm1 = class(TForm)    Button1: TButton;    Button2: TButton;    procedure FormCreate(Sender: TObject);    procedure Button1Click(Sender: TObject);    procedure Button2Click(Sender: TObject);  end;var  Form1: TForm1;implementation{$R *.dfm}var  MyMenu1,MyMenu2: TMainMenu;  Item: TMenuItem;procedure TForm1.FormCreate(Sender: TObject);begin  {建立第一个菜单}  MyMenu1 := TMainMenu.Create(Self);  MyMenu1.AutoHotkeys := maManual;  Item := TMenuItem.Create(MyMenu1);  Item.Caption := 'AA';  MyMenu1.Items.Add(Item);  Item := TMenuItem.Create(MyMenu1);  Item.Caption := 'BB';  MyMenu1.Items.Add(Item);  Item := TMenuItem.Create(MyMenu1);  Item.Caption := 'CC';  MyMenu1.Items.Add(Item);  {建立第二个菜单}  MyMenu2 := TMainMenu.Create(Self);  MyMenu2.AutoHotkeys := maManual;  Item := TMenuItem.Create(MyMenu2);  Item.Caption := 'XX';  MyMenu2.Items.Add(Item);  Item := TMenuItem.Create(MyMenu2);  Item.Caption := 'YY';  MyMenu2.Items.Add(Item);  Item := TMenuItem.Create(MyMenu2);  Item.Caption := 'ZZ';  MyMenu2.Items.Add(Item);  Self.Menu := nil; {当前 Form 没有指向任何一个菜单}end;procedure TForm1.Button1Click(Sender: TObject);begin  Self.Menu := MyMenu1; {指向第一个菜单}end;procedure TForm1.Button2Click(Sender: TObject);begin  Self.Menu := MyMenu2; {指向第二个菜单}end;end.