GRUB_DEFAULT=save doesn't work as expected

[magowiz82]

I followed this guide to create a button that makes mine pc reboot in windows:
http://www.uluga.ubuntuforums.org/showthread.php?t=1490650

the problem is that when I reboot from windows it keeps windows as mine default instead of setting it to linux (like I wanted) , in another pc this work as I expect but here no.
The configuration is the same:
in /etc/default/grub

GRUB_DEFAULT=saved

the script that reboots mine pc is :

#!/bin/bash
grub-reboot "Windows NT/2000/XP (loader) (on /dev/sda1)"
reboot


What should I do?

What I want is that, when clicked, the button reboot in windows once and on next reboot the default is linux, is it possible ?

[magowiz82]

Now it works as I expect: I rechecked mine script and added the full path to commands, I also enabled the sticky bit to reboot and grub-setenv (perhaps I forgot to do so before)