Good way to trigger exit event for VI's loaded in subpanels?

Sorry if this is a novice question, but I haven't gotten much traction searching for an answer the last couple days.
I have a setup that uses remote panels for an interactive "lab."  The panel loads a reentrant VI that is just a tab control, the front of which has a user/password/lab selection form, and upon proper credentials being entered tabs to one large subpanel.  This panel loads the selected lab VI, which is itself just a rudimentary VI with 2+ subpanels, each of which loads a specific instrument.  The instrument VI's are being held open by the subpanels, so that if the user closes the browser everything exits.  It all seems to work fine so far.
What I'm wondering is if there is a simple way to force a handful of commands/cleanup-actions before these instrument VI's leave memory.  One device in particular ramps high voltage on start, and I'd like to ramp it down as part of a cleanup step.  Is there an easy way to incorporate this with my setup?  If not, what's the best way fundamentally to handle something like this?  I'm far from an expert, but if there is a lot better way to design a setup like this I'd love to hear it. 
Thanks for any help.

Thanks for the reply.
I actually have toyed with both the application close? and panel close? events.  Panel close doesn't seem to trigger off a subpanel (I think I read that in the help too).  Application close doesn't trigger because I have to keep the highest level vi's front panel open or the remote panel doesn't display anything, and for my purpose that interface has to be active 24/7, even if individual labs aren't in use. 
Maybe I should rephrase the question... is there any way to detect when a vi loaded in a subpanel is about to be taken out of memory because the subpanel is no longer viewing it? 
I'm thinking if not perhaps there is a way to detect if a VI is loaded in a subpanel with another independent VI, and when that VI sees that the instrument VI in question is no longer running (due to the subpanel closing) it takes the appropriate action, rather than integrating cleanup into the instrument itself....  Anyone have any experience with this?

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