Hey Clint,
You can determine whether an execution passed or failed by using one of the methods of the execution manager. I'm attaching a modified version of the Simple OI. I've included a button on the front panel. I've added a case in the event structure that displays a message box displaying the current state of the execution when the button is clicked. One thing to notice is that once the execution is closed the message box displays nothing. This is because there is no current execution to determine the status of. So, you will need to retrieve the status of the execution before you close it.
I hope this helps!!
Regards,
Sarah Miracle
National Instruments