{
먼저 프로젝트 하나를 시작하구요
폼에 버튼을 4개 놓으세요.
그리고 밑의 예제를 실행해 보시면
아실겁니다.

도움되시길...
}





unit Unit1;

interface

uses
  SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
  Forms, Dialogs, StdCtrls, Buttons;

type
  TForm1 = class(TForm)
    BitBtn1: TBitBtn;
    BitBtn2: TBitBtn;
    BitBtn3: TBitBtn;
    BitBtn4: TBitBtn;
    procedure BitBtn1Click(Sender: TObject);
    procedure BitBtn3Click(Sender: TObject);
    procedure BitBtn2Click(Sender: TObject);
    procedure BitBtn4Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.BitBtn1Click(Sender: TObject);
begin
   bordericons:=[biSystemMenu,biMaximize];
end;

procedure TForm1.BitBtn3Click(Sender: TObject);
begin
    bordericons:=[biMaximize,biMinimize];
end;

procedure TForm1.BitBtn2Click(Sender: TObject);
begin
  bordericons:=[biSystemMenu,biMinimize];
end;

procedure TForm1.BitBtn4Click(Sender: TObject);
begin
  {토클}
if borderstyle=bsDialog then borderstyle:=bsSizeable else borderstyle:=bsDialog;
end;

end.