Exporting vertex colors to FBX format


I started working with Blender this past week and i’ve been able to succesfully export a UV textured skinned model to FBX format for use in XNA. I haven’t been able to properly assign and export vertex colors. I have tried using the vertex paint tool, but when I open up the exported FBX format, the vertex colors aren’t what I assigned. Is there anything else I have to do to get this to work? I just want simple vertex color assignment.