modem and network manager

[Rakotomandimby Mihamina]

Hi,
I got a GPRS modem on USB port.
I set it up correctly so that I just connect with "pon orange", after 
loading the "cdc-acm" module.

I can systematically load the cdc-acm module at boot time.

But now, I would ask for some tips on how to use the Gnome Network 
Manager in order to connect through it instead of using command line 
such as "sudo pon orange".

My /etc/ppp/peers/orange and /etc/chatscripts/orange files are just OK.
The way to use it with the Network  Manager is all the missing.

Any help?
Thank you.