Cannot rewire Cubase 6 with Reason

Im having problems trying to rewire cubase 6 with reason 4 … when I launch reason , after launching cubase i cant find the rewire tab/button . when i had cubase 3 i had no problems !! I have a few versions of reason , 3 and 4 and I dont think any of them work … am I wrong ? pls help

Cubase 6 32 bit?
or
Cubase 6 64 bit?