As far as I understand, shortcuts like Alt+F4 (close a window), Alt+Tab (cycle windows), etc. are handled by Xfwm4.
They all work fine under my Xfce 4.10 under Xubuntu 14.04.
However, as soon as I want to remap keys using xmodmap, e.g.
xmodmap -e "keycode 77 = NoSymbol NoSymbol NoSymbol"
to deactivate the Numlock key, they completely stop working. The same happens if the above line is put in a file ~/.Xmodmap
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