title: What to return from tableView:objectValueForTableColumn:row:?
body: <p>New to Cocoa programming on OSX. Came from iOS programming. It seems like NSTableView programming is similar to UITableView programming. So I'm trying to implement a part of the NSTableViewDataSource protocol but I don't know what to return from the tableView:objectValueForTableColumn:row:method in order to get a simple string to display on a row and column. I've googled, skimmed the Apple documentation and can't find anything. The method returns type "id" so that's no help. Thanks.</p>