[CentOS] Xen-server in virt-manager Paravirtualized doesn't work

Wed Apr 21 13:12:01 UTC 2010
Georghy <fusco at wanagain.net>

Hi all,
I'm setting up a virtualization software on CentOS,
using virt-manager, KVM, qemu and Xen
When I want to create a VM, paravirtualized mode isn't possible (ie it 
is grey)
What should I do to use xen paravirtualized mode ?
i figured that xen is not running but /etc/init.d/xend start doesn't work
xen and xen-kernel are installed on the machine (rpm -qa | grep xen 
replies : xen & xen-kernel)
thanks for all help

Cordialement, / Greetings,
Georghy FUSCO