While almost all interface tools allow for default values, the listbox / manually set values does not. The idea would be for a property on each line that when displayed to the user would have one or any values checked upon entry. The configuration might look like Name:Value:Default. I.e.
I would use this to pre-populate the listbox with entries from a database that would essentially allow the user to edit his previous entry. In this example, the user previously selected Alabama and the results were stored in a database. When editing the record using an analytics app, I would want the user to see what he chose and the other options available.