本例效果图:

代码文件:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
begin
Self.BorderIcons := Self.BorderIcons - [biMinimize, biMaximize];
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
Self.BorderIcons := Self.BorderIcons + [biMinimize, biMaximize];
end;
end.
设计时修改方法:
