xfce, desktop background setting time

[v_andal]

Maybe someone can help. I've setup slim and xfce to have the same background image. With previous version of XFCE this resulted in nice replacement of login prompt with the session desktop. After upgrade to the newer version of XFCE I started to get ugly light grey background during session init. Is there any way to tell XFCE not to initiate the background? Or set the background image instead of filling it with the grey color?