private void  LoadStatsForSelectedGroup()
        {
            PicesClassStatisticList nextBunch = null;

            if (allSipperFiles || (!String.IsNullOrEmpty(sipperFileName)))
            {
                nextBunch = dbConn.ImageGetClassStatistics
                                (selectedImageGroup, // ImageGroup
                                sipperFileName,
                                mlClass,
                                classKeyToUse,
                                probMin, probMax,
                                sizeMin, sizeMax,
                                depthMin, depthMax
                                );
            }
            else
            {
                nextBunch = dbConn.ImageGetClassStatistics
                                (selectedImageGroup, // ImageGroup
                                cruiseName,
                                stationName,
                                deploymentNum,
                                mlClass,
                                classKeyToUse,
                                probMin, probMax,
                                sizeMin, sizeMax,
                                depthMin, depthMax
                                );
            }

            if (nextBunch == null)
            {
                return;
            }

            blocker.StartBlock();
            if (loadedStats == null)
            {
                loadedStats = new PicesClassStatisticList();
            }
            loadedStats.Add(nextBunch);
            imageCountTotal  += nextBunch.ImageCountTotal;
            newStatsAvailable = true;
            blocker.EndBlock();

            nextBunch = null;
        } /* LoadStatsForSelectedGroup */