How to tell blender what is the track object

I've been testing out some ideas on new tracks but I can never export my track correctly, I always get empty xml files and STK complains about missing models. My track only has one single object that is supposed to represent the track, I made it by extruding a plane into the track shape.
I've followed the wiki pages about page creation, and I've activated the flag marking my scene as a track.
I'm just trying to export the track, I want no other objects and I have no other objects in my blender file, only one plane that was extruded to make the track and the two vertices that tell the direction (this part I had some trouble understanding as it's not explained and it makes little sense ), so it there any magical thing I must activate in order for my track to be exported? I just wanted to test the layout before doing anything else.
I'm using blender 2.60.
Regards,
Knitter
I've followed the wiki pages about page creation, and I've activated the flag marking my scene as a track.
I'm just trying to export the track, I want no other objects and I have no other objects in my blender file, only one plane that was extruded to make the track and the two vertices that tell the direction (this part I had some trouble understanding as it's not explained and it makes little sense ), so it there any magical thing I must activate in order for my track to be exported? I just wanted to test the layout before doing anything else.
I'm using blender 2.60.
Regards,
Knitter