Objects not seen when exporting

Hi,I'm using Maya 2008 and trying to export a character model to dts.I am using a mesh that is downloaded from internet.model consists of polygon body and its eyes are made up of nurbs....so inorder to export from maya i had converted it into polygons.... and when I am exporting, eyes r not getting exported...all other meshes r expoted .I've been trying to get this model to export for 3 days now. so anyone pls respond or give me a suggestion how can I solve this problem.....