compiz hotspot command fails

[kenn]

I added `xdotool click 4` to compiz commands plugin which is supposedly triggered when I click  upper-right corner hotspot, but when I click upper-right corner of the screen nothing happens, it fails to scroll in the active window. I tried it from terminal like `sleep 5; xdotool click 4` then switched to any window, it managed to scroll in that window. So I think it is a window focus problem. How can I make it work?