Render-in-Place with Multitimbral VSTi?

Yeah, I just found a Steinberg web page that details that.

https://www.steinberg.net/nc/de/support/knowledgebase_new/show_details/kb_show/cubase-8-versionhistory-and-issues-and-solutions.html

However, none of that is working for me. I’m using Kontakt 5 and all of the midi channels in use have their own audio channel. I’d think “Mix Down to One Track” would be my solution…however that option is greyed out for me.

Can anyone puhlease help me with this?