how to get desktop icons show in VNC on ubuntu11.10

[vichy]

hi all:
I install ubuntu 11.10 on my target machine with vnc4server.
When I use vnc client to connect to this machine, I cannot see my desktop.

in ubuntu 11.04, I type "gnome-session &" in my xstartup.
but I know since 11.10, unity replace gnome as the window manager.

Is there any specific setting I should add in my xstartup?
if not, how can I let gnome running on when vncserver started?


Thanks in advance,