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How to disable the close x button on a form

unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs; type TForm1 = class(TForm) procedure FormCreate(Sender: TObject); private { Private declarations } public { Public declarations } end; var Form1: TForm1; implementation {$R *.dfm} procedure TForm1.FormCreate(Sender: TObject); var hMenuHandle : HMENU; begin hMenuHandle := GetSystemMenu(Form1.Handle, FALSE); if (hMenuHandle <> 0) then DeleteMenu(hMenuHandle, SC_CLOSE, MF_BYCOMMAND); end; end.