I've imported a poser obj (hiro 3) into carrara.  I import a BVH file.

According to this tutorial:  http://www.youtube.com/watch?v=8Jy5Z6YbtwQ

I should then be able to select Hiro and the imported BVH skeleton and attach the skeleton to the object.  But that option is gray in the animation pull down. 

Can someone provide a link or a simple step by step to bringing in a Poser 7 object (a character) then animating it with a BVH?