OptionalonFired immediately after a View, its CameraFlight, and its ViewController have all been constructed and recorded. Studio attaches the context-menu listener and IBL here.
OptionalonFired just before a View is destroyed and removed from the
views map. The View is still usable at this point.
Per-event hooks the manager fires while it owns view lifecycle. Studio uses these to layer on the context-menu wiring and HDR-sky setup that used to live inline in the old
createView.