Ext.data.Store.prototype.applySort = function() {   

    if (this.sortInfo && !this.remoteSort) {   

        var s = this.sortInfo, f = s.field;   

        var st = this.fields.get(f).sortType;   

        var fn = function(r1, r2) {   

            var v1 = st(r1.data[f]), v2 = st(r2.data[f]);   

            if (typeof(v1) == "string") {   

                return v1.localeCompare(v2);   

            }   

            return v1 > v2 ? 1 : (v1 < v2 ? -1 : 0);   

        };   

        this.data.sort(s.direction, fn);   

        if(this.snapshot && this.snapshot != this.data) {   

            this.snapshot.sort(s.direction, fn);   

        }   

    }   

};