Grid Grouping Control Updating sorted records

I am trying to update the underlying data in that is being used in the grid grouping control. However the field I am updating is the same one that the grouping (and subsequently the sorting) is done on. So when I change one row the filteredrecords are updated and I can no longer continue my iteration properly. What is the safe way to update multiple records that are sorted?

I may be overlooking something, but I think this should work. Record.GetData() should return the underlying object (DataRowView if you are using a DataSet/DataTables). If you cache this underlaying object, and modify it directly, I do not think it should matter if the FilterRecords collection changes as you will still be working on the same object (DataRowView).