procedure TForm1.FormCreate(Sender: TObject); 
var 
  l: DWORD; 
begin 
  l := GetWindowLong(Self.Handle, GWL_STYLE); 
  l := l and not (WS_MINIMIZEBOX); 
  l := l and not (WS_MAXIMIZEBOX); 
  l := SetWindowLong(Self.Handle, GWL_STYLE, l); 
end;