XFCE adding keyboard shortcut

[az20110303]

I want to add keyb shortkut for "xfce4-screenshooter -w" command - it is printscreen of an active window. So i enter Menu->Settings->Keyboard and push Add button. I enter command "xfce4-screenshooter -w" in the command field and then push <Alt>+<PrintScreen> but for some reason only <Alt> is triggered as key to the command. I can push for example <Alt>+<p> and it is triggered normally. Why can't i use <Alt>+<PrintScreen>?

[disi]

Alt+PrtSc is for me SysRq, which is used to send keyboard commands directly to the kernel. I guess that's not an option to make a screenshot?

Maybe Shift+PrtSc might work?
_________________
Gentoo on Uptime Project - Larry is a cow