What's new in oleGridSort V1.1.0?
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1. The error constants have changed to the actual value returned in
   Err.Number, rather than the value offset from vbObjectError.

2. The SecondSortCol property will now return an error if the specified
   column is outside the allowed range, rather than just silently 
   resetting to SG_NOSECONDSORT.

3. Various minor code changes to prevent possible problems arising.