CTRL+F5 in Google Chrome in XFCE

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http://askubuntu.com – i've instaled ubuntu with unity by default, but compiz + java develop sucks in a ATI graphic card, so, I instaled the xubuntu-desktop package. The problem is: in google chrome (wich i use to test my web apps), when I press CTRL+F5(clean cache and refresh), it simple do nothing. I think this is some issue with XFCE keyboard shortcuts. Anyone know how to solve it? thanks in advance. (HowTos)