How to get vi close event..??

Hi i am a begginer in labview.
I have a main Vi, and i am using a sub vi for communicating to device via COM1 (RS232).
The problem if the main vi is stopped or closed then i want to make sure that COM1 has been released.
So i want to check and close if COM1 is open in the main VI but i dont know how to get an event of vi closing or stopping..

Holy Mackerel! a 3633px x 757px jpg?  Not sure what the point of that was since the VI was probably smaller than that image.
In any case I think you might benefit from going though the LabVIEW basics course.  If you're trying to do what I think you don't need a notification of when the VI is done because there can be output from your VI to preserve data flow.  If you use that VI and say have an ouput terminal of an error cluster (instead of handling it in this VI) then when data comes out of that error cluster you know the VI is done executing.  A similar thing could be done using sequence structures, you'll know the VI is done when it goes to the next state in the sequence strucutre.  This is the less prefered method.
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