Anyone out there mixing VCL and FMX forms in the same application?

Anyone out there mixing VCL and FMX forms in the same application? 

I have been using MonkeyMixer (https://github.com/LaKraven/MonkeyMixer) and while I can technically add FMX forms to a VCL app this way, launching the FMX form in the usual 'create, showmodal, free' kind of pattern doesn't quite work - for instance, the OnActivate events doesn't seem to fire. 

Does anyone have a good primer on launching non-trivial FMX forms from a VCL app? 
(I mean non-trivial as in something more than a TButton and a TLabel, if you see what I mean).
https://github.com/LaKraven/MonkeyMixer

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