Papervision 3d MovieAssetMaterial Problem

Hello

I have a problem attaching a movie clip material dynamically from library in pv3d. The MovieAssetMaterial class allows you to attach dynamic mc from library. Now the problem is the MovieAssetMaterial class requires the Moiveclip linkage id in the constructor. But as we know that in AS3 the concept of linkage id is no more.

So can anyone please tell how to define the linkage id or else how accomplish this thing in AS3.

Thanks in advance.