Unity UI for AR Glasses? (Stereoscopic)

Have only been playing around with a pair of R7's for a day or two now, so forgive me if this has been answered or is an obvious question.  How do you use the Unity UI system with AR Glasses that require stereoscopic cameras? I require tracking in my apps, so I have to use stereoscopic cameras for the tracked 3D object, but I also need a UI. The Unity UI system does not appear to play nice with eh ARCamera, it's always either not visible or spread across the two views so each eye is given half of the UI, which is not a good result. Is there anyway I can overlay the UI to both cameras the same so the user can see and focus on the UI or on the 3D object? Or is there never supposed to be a UI while tracking an object (which seems like it can't be true)? 

Let me know what I'm missing about creating UI's for glasses. Also, I have tried SetDisplayExtended(false) or true and the UI does then look correct, but of course then there are 2 3D objects rendered, so it seems like you only get either 1 or the other.

Thanks