Hi,
I hope you have a software stop in your program, i.e. not using the Abort button.
If you have a software stop you can programatically force the program to execute a property node connected to the list box. If you change the property node to "Write" you can update your Listbox with a 2D array with empty strings. I made a small example to show what I mean.
Robert S
AE National Instruments Sweden