Ati Changed Into Mesagl After Xgl

Can anyone give me help. My ATI gfx suddenly changed into MesaGL after change DISPLAYMANAGER_XSERVER from Xorg into XGL.

I want to activate Compiz/Beryl, so I change the XSERVER from Xorg into XGL (It works), but my gfx changed back into MesaGL.

When I use Xorg and do aticonfig then run fglrxinfo, my gfx detected as ATI.

I need guide to configure ATI for XGL XServer environment. When I use Xorg I just type aticonfig --initial=dual-head --input=/etc/X11/xorg.conf then it done, so how about XGL?

Thanks for advice.