Is there a way, from the DataGrid, to work out if any of it's rows have a validation error? I know you can use the Validation.HasError property at the level of an individual cell, but it seems that information doesn't filter back up to the DataGrid so
you can test a simple property on the DataGrid to see if there are any errors (i.e. if you get Validation.HasError at the DataGrid level, it's always false regardless of whether or not there are any errors).
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