Looks like I found solution.
I created custom xsession in /usr/share/xsessions/
with Exec=xfce4-session
instead of Exec=startxfce4
.
Also maybe this work for somebody: http://www.linuxquestions.org/questions/linux-general-1/reboot-shutdown-button-of-xfce4-not-working-937263/ .
Looks like I found solution.
I created custom xsession in /usr/share/ xsessions/
with Exec=xfce4-session
instead of Exec=startxfce4
.
Also maybe this work for somebody: http:// www.linuxquesti ons.org/ questions/ linux-general- 1/reboot- shutdown- button- of-xfce4- not-working- 937263/ .