Getting KDE applications to recognize Forward/Back mouse buttons

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http://unix.stackexchange.com – I have a mouse with Forward/Back buttons which work correctly in Firefox, Chrome etc... i.e. they are recognized. They are also seen by xev which generates events, e.g. ButtonRelease event, serial 35, synthetic NO, window 0x6200001, root 0xaf, subw 0x6200002, time 29607818, (36,54), root:(38,108), state 0x10, button 8, same_screen YES I now want to use them to change virtual desktops when my cursor is pointing at the KDE (Plasma) desktop. However, the "Mouse Actions" parameter at the Plasma desktop settings does not recognize the clicks of those buttons. Also, Dolphin does not seem to reco (HowTos)