KDE apps running on XFCE have no icons in menus.

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https://bbs.archlinux.org – I have the same issue since (no exaggerating) years ago. I've several times tried to google the problem, and even posted in forums, but never got any results.Everything started with Skype: I realized that, when running skype in Xfce, the program menus had no icons, whereas in other desktops (same or different OS) the icons were there. Now, recently I've noticed that also the Virtualbox gui (which is qt-based) also does not have icons in the menus when run under Xfce.Only once it worked: (HowTos)