delphi程序全屏顯示無標題欄覆蓋整個屏幕

delphi 程序全屏顯示無標題欄，覆蓋整個屏幕，這個在做工控機或屏保時有用的，所以記下

procedure TMainFrm.FormCreate(Sender: TObject);
begin
with MainFrm do begin
{ Position form }
Top := 0 ;
Left := 0 ;
{ Go full screen}
BorderStyle := bsNone ;
WindowState := wsmaximized;
ClientWidth := Screen.Width ;
ClientHeight := Screen.Height;
Refresh;
SetForegroundWindow(Handle) ;
SetActiveWindow(Application.Handle) ;
end;
end;