vs2005 rc1 database updating failing - update requires valid updatecommand

I'm trying to use vs2005 to do some simple (so far) database opperations. For now i'm just trying to use the built in functionality. I've added a sql-express database file to a new VB.net project.
The ONLY thing i have done in this new project is add the sql-e database, open the dataset, switch the single table to details view and drag the table onto the form.
Everything seems to go ok at this point. It adds all the database fields to the forms and ads the binding navigator. When i debug, i can page back and forth through the records, but when i try to update a record i get this error:
Update requires a valid UpdateCommand when passed DataRow collection with modified rows. I get this when i click on the save button on the navigator control.
Is there some step i am missing? i thought that for at least this basic level of functionality it was all supposed to be drag and drop?
thanks
[940 byte] By [merk] at [2007-12-17]

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