No PV option for xapi?

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http://serverfault.com – I have installed xcp-xapi on my Dom0 server. When I tried to create a VM, I found there are no options for me to create a PV VM based on existed kernel, initrd image and qcow2 disk image! Anyone can tell me how to create a PV VM via Xen API? In xl, I can easily create a config file and invoke xl create to create such a VM. But for xapi, I can hardly find a command works like that... BTW: I also tried XenCenter and found nothing useful. (HowTos)