Bug in May 2004 VS 2005 CTP ?

This one worked in March preview but does not in May's.

web site project -> page -> design mode -> drag gridview control -> common gridview tasks -> choose datasource -> new datasource:

Error: "Error setting value '<New DataSource...>' to property 'DatasourceID'. Details: String can not have zero length".

Hey it is impossible to work with data without this feature. Some workaround available ?

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