How do I bind combobox text to legacy data not in the drop down list?

This answer (to my own question) was pulled from a comment in the NathanAW answer.

It seems that you might be able to simplify this by not using a Multi-Binding converter. If you have a collection of NPR objects, then you can set that as the ItemsSource for the listbox. Then use the DataTemplate to format how you want that item displayed.

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