XFCE: some KDE icons are not shown

I've noticed that some icons in KDE Applications are not shown, or replaced by other icons from default gnome set. Solution should be to change icons in the XFCE setting, but if it doesn't work, you can try setting them with gconftool:

gconftool-2 --type boolean --set /desktop/gnome/interface/buttons_have_icons true
gconftool-2 --type boolean --set /desktop/gnome/interface/menus_have_icons true