How can I terminate a subVI using dynamic events?

I've got a VI which can bring up a user-interactive subVI. The subVI front panel is visible and has event structure associated with it.
I'd like to programmatically terminate the subVI from an action on the parent VI. Can I do this through dynamically registered events, or user events, somehow?
What I'm trying to do is implement a LabView-like Graphical Control Palette (shortcut menus). The user should be able to kill the subVI (a menu-like VI) by clicking on the main VI.
My not-so-good approach is to have a short timeout to the subVI and read the value of a control reference which is passed from the main VI. I'd rather not have to use the timeout for this, though.
Thanks,
Tom
LabView 8.2
Full Development System.

Create a user event and use it. You can see an example here.
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