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$scope.getGroupedChildFoundsetUUID = function(parentFoundset, parentRecordFinder, parentLevelGroupColumnIndex,
                                                              newLevelGroupColumnIndex) {
        if (!parentFoundset) parentFoundset = $scope.model.myFoundset.foundset;
        var childQuery = parentFoundset.getQuery();
		
        if (parentLevelGroupColumnIndex == undefined) {
            // this is the first grouping operation; alter initial query to get all first level groups
            (...)
        } else {
			// this is an intemediate group expand; alter query of parent level for the child level
			childQuery.groupBy.clear();
            childQuery.groupBy.add(childQuery
                      .columns[$scope.model.columns[newLevelGroupColumnIndex].dataprovider]);
            var parentGroupColumnName = $scope.model.columns[parentLevelGroupColumnIndex].dataprovider;
            childQuery.where.add(childQuery.columns[parentGroupColumnName]
                      .eq(parentRecordFinder(parentFoundset)[parentGroupColumnName]));
        }
		
        var childFoundset = parentFoundset.duplicateFoundSet();
		childFoundset.loadRecords(childQuery);
		
		var dps = {};
		for (var idx = 0; idx < $scope.model.columns.length; idx++) {
			dps["dp" + idx] = $scope.model.columns[idx].dataprovider;
		}
		
		$scope.model.hashedFoundsets.push({ foundset: {
			foundset: childFoundset,
			dataproviders: dps,
			sendSelectionViewportInitially: false,
			initialPreferredViewPortSize: 15
		}, foundsetUUID: childFoundset}); // send it to client as a foundset property with a UUID
		
		return childFoundset; // return the UUID that points to this foundset (return type will make it UUID)
	};