I have been researching on how to get this for about a week and most of the posts are how to build a new listbox in a Web page form.
Tricky to answer without knowing more about your code and the webpage. First of all, are you using the InternetExplorer.Application COM object? If so, then you should be able to find the ID or Name (ID is better, if present) of the list box you're trying to modify, and use something like $IE.Document.GetElementById('listbox_id_here') . From there, I don't know exactly what properties or methods you'd call, but you can pipe that object to Get-Member to figure it out.
Alternatively, you could look into something like Selenium, which is a whole suite of tools dedicated to this sort of automated testing (http://www.seleniumhq.org/)
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