Comodo Firewall (without AV) deactivates AVAST WebGuard

when I install Comodo Firewall (without AV) the Webshield of Avast Pro/Free gets gray, and is it not active.
I dont thing this is normal?
How to fix it?

Avast Pro 4.8.x
WINDOW 7 (64Bit)

I also am running AVAST and I do not have this problem. It is possible that during the install or first run D+ has prevented a service from running.

Check your D+ and firewall event logs to see if there are entries. Also check your rules.

Hope this helps