Hello,

There is no public API that you can use to achieve that. However you can use a private variable "_tableView" like this:

function resetSort() {

    var pivot = $("#pivotGrid").data("igPivotGrid");

    pivot._tableView.levelSortDirections([]);

    pivot._tableView.columnSortDirections([]);

    pivot._tableView.initialize();

    pivot.updateGrid();

}

Here is a Fiddle: http://jsfiddle.net/ef91c50o/2/

Note: As this approach uses an internal variable, it might not work in future versions.

Best regards,
Martin Pavlov
Infragistics, Inc.