Lock screen in compiz

Is there a way to lock the screen in compiz, except using ctrl-alt-backspace ?

When I use system->lock , I'm getting the following error:
.

No PAM support was built into Enlightenment, so desk locking is disabled

Solution:
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Install this debian package - xtrlock_2.0-12_i386.deb - with the command "dpkg -i xtrlock_2.0-12_i386.deb" and execute as follows:


export DISPLAY=127.0.0.1:0.0

xtrlock


This will show you a blue lock on the screen. The only way unlock again is to type the password of the user who locked the screen. The characters you type will not be displayed on screen

This problem is fixed for the next update (recommended to use a newest iso due to the big change of e17-compiz)