Get contents of a listbox?

I'm working with a listbox and am having the user add or modify it's contents. Problem is I can't get the contents back out of the $listbox object. Is there an appropriate method? 

This post might help. 
http://social.technet.microsoft.com/Forums/windowsserver/en-US/d836b9bc-08db-4a9a-8369-fb254d55b8f3/form-returns-null-values-or-empty-values-for-variables-after-clicking-ok-button?forum=winserverpowershell
I've seen other threads that tend towards an issue with scoping the variable correctly and that would be my guess what could be giving you trouble, too.
I hope this post has helped!

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