If you have a store with multiple sorters a bug occurs in Ext.util.Sortable::createComparator().

Code:



createComparator: function(sorters) {
    return sorters && sorters.length ? function(r1, r2) {
        var result = sorters[0].sort(r1, r2),
            length = sorters.length,
            i = 1;
        
        
        for (; !result && i < length; i++) {
            result = sorters[i].sort.call(this, r1, r2); // <--- Bug


            // Correct implementation might look like:
            var sorter = sorters[i];
            result = sorter.sort.call(sorter, r1, r2);
        }
        return result;
    } : function() {
        return 0;
    };
}