ZBrushCentral

Insert Multi Mesh UVs?

I am still learning ZBrush and recently created a character wearing a jump suit. I added a zip using the insert tri-mesh brush. My question is, where are the uv’s? If I flatten the jump suit it lays out all the uv shapes except for the zip which isn’t included.
I need to export to Maya for shading but can’t see how I’m going to shade the zip? Any help much appreciated.

http://www.zbrushcentral.com/showthread.php?172965