procedure SortIndexRecord(var A: array of TIndexRecord; iLo: Integer; iHi: Integer);
Sort an array of TIndexRecords.
Result: stored in self (calling object)
Remarks:
iLo is the lowest array index in iHi is the highest array index. The method calls the ClassifyTest method, This virtual method has to be implemented or the classification results need be returned via the OnClassifyTest event.