The solution is this:

1) Create a new action (f.ex. named "Bring Logic to front") with this piece of AppleScript

tell application "Logic" to activate

2) Then add it to your Behaviour at Behaviour Factory > Actions.

3) Finally, select it at Behaviour Factory > Default Mapping > Events > On automatic activation (foreground)

4) Execute a "Compile, test and permanently install scripted Behaviour"

I've had a few people ask for a Behaviour that supports Logic. If your Behaviour is general enough, please consider sharing it. A few people would be very happy about it for sure.

Best regards, 
Felix Schwarz