delphi点击关闭按钮让窗体最小化

unit Unit1;interfaceuses  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,  Dialogs;type  TForm1 = class(TForm)  protected    procedure WMSysCommand(var Message: TWMSysCommand); message WM_SYSCOMMAND;  end;var  Form1: TForm1;implementation{$R *.dfm}procedure TForm1.WMSysCommand(var Message: TWMSysCommand);begin  case Message.CmdType of    SC_CLOSE: begin                Perform(WM_SYSCOMMAND, SC_MINIMIZE, 0);                Exit;              end;  end;  inherited;end;end.