If you want to show information associated with another business object within the same browse, look at the sample in the "Samples and Solutions" are of the forum on from the main page. There is a sample that shows how to use an InformationPanel within the browse dialog which ultimately allows you to do anything you want.
As for the BrowseDialog, you cannot add parent fields to the list results themselves, but if you create a BrowseInformationPanel, you can show any additional information within the panel.