[Quote title=""]
unit Unit1;

interface

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

type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
procedure Button2Click(Sender: TObject);
private
private
procedure WMsyscommand(var msg : Twmsyscommand);message wm_syscommand;
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure Tform1.WMsyscommand(var msg : Twmsyscommand);
begin
if msg.CmdType = SC_MAXIMIZE then
showmessage('现在最大化')
else if msg.CmdType = SC_MINIMIZE then
showmessage('现在最小化');
inherited;
end;

end.

[/Quote]