Core Data Document-Based App Issues

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hello!
created core data document-based application , created 1 entity , binded attributed columns in nstableview.. can save files, program won't open files. can select , open it, no data appears in columns. i'm not sure show here because haven't written code..should upload project can @ it? according these tutorials:
http://developer.apple.com/cocoa/coredatatutorial/index.html
shouldn't have write code open/save files. correct?
thanks!
 



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