NI Kontakt VI: How to render/mix to a stereo AIFF file?

[FrankDSM]

I am a newbie to DP 4.6. I have PP 4.6 and I use NI Kontakt and B4 in a virtual instrument rack. When I bounce to disk with the NI MIDI track selected, the AIFF is silent. Bounce to disk with both a stereo audio track and the NI MIDI track generates only the stereo audio track in the AIFF. I don't understand how to render or mix a 16 bit AIFF stereo file which has the NI sounds even though I hear them when I push play.
I tried routing to a new stereo bus as well as an AUx from that bus but no success.

If you know how to do this please give a step-by-step description.
I just want a mixdown to listen to.

Thanks
Frank