关于form的parent(100分)

try this.

Form1 上放个 Panel, Panel上放Button1、2
Button3放在Form1上。

--------------------- Form1 ---------------------------------
unit Unit1;

interface

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

type
TForm1 = class(TForm)
Panel1: TPanel;
Button1: TButton;
Button2: TButton;
Button3: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

uses Unit2;

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
ShowMessage('1');
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
ShowMessage('2');

end;

procedure TForm1.Button3Click(Sender: TObject);
begin
form2.Show;
end;

end.

---------------------- Form2 -----------------------
unit Unit2;

interface

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

type
TForm2 = class(TForm)
procedure FormShow(Sender: TObject);
procedure FormClose(Sender: TObject; var Action: TCloseAction);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form2: TForm2;

implementation

uses Unit1;

{$R *.dfm}
var
pan: TPanel;

procedure TForm2.FormShow(Sender: TObject);
begin
Form1.Hide;
pan:=TPanel.Create(nil);
pan:=Form1.Panel1;
pan.Parent:=Form2;
end;

procedure TForm2.FormClose(Sender: TObject; var Action: TCloseAction);
begin
Form1.Show;
pan.Parent:=Form1;
pan:=nil;
end;

end.

多人接受答案了。