Xfce Settings Manager icons

[bybor]

Hi.

I'm using XFCE 4.6.1 in Zenwalk 6.2.

Wanted to set custom icon theme downloaded from gnome-look.org

http://www.gnome-look.org/content/show.php/ALLBLACK?content=70630
http://www.gnome-look.org/content/show.php/Nostromo?content=101422

The icon themes are applied, but after X restart Settings Manager
doesn't show icons for all of its applets, drawing empty placeholder
in their place. Trying to select them with keyboard and pressing
'Enter' leads to Settings Manager being closed.

Not sure, if it's possible to use gnome icons in XFCE?
The used themes may lack icons used in Settings Manager, but I've read
somewhere that standard icons are used in this case.

Tried running gtk-update-icon-cache for selected theme before and
after applying it.

Any hints will be appreciated.

-- 
Best regards,
    Aleksey Baibarin