editing keyboard layouts on VISTA

Hi, I developed a custom keyboard for Windows XP that include some
useful characters thet are missing in regular italian layout (accented
capital lecters, copyright symbols, you may see a complete list at
http://www.paolobesser.it/tastiera). I need to use this layout on Vista,
but I can't. If I try to install my custom layout I notice thet my
keyboard is correctly listed among available ones, I can even set it up
in the correct place
(control panel > keyboard and other language ecc > change
keyboard > regional and language options > keyboard and languages > settings
> "italiano redazionale v1.2")
but it doesn't produce any result: when I press my keyboard, regular
italian layout is used. I also noticed that if I click on "Properties",
I can't see any character assigned to keymap. So I have some question:

- are custom XP keyboard layout still compatible with Vista?
- is there anything like this
http://www.microsoft.com/globaldev/tools/msklc.mspx for Vista?

Please help me: I created my custom keyboard layout 'cos I need it for
my job. I can't live without it :-)
Seriously,

p.bes