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After upgrading from version 2012.1.214 to version 2012.1.419, grouped columns in the grid are no longer persisted after calling grid.rebind(); Rolling back to version 2012.1.214 fixes the problem. I haven't been able to find any information detailing this behavior in the support forums or in the release notes for version 2012.1.419. Is this a know issue with this version, or has the rebind method been modified to clear grouped columns? Thanks.