static/ext/src/util/Sorter.js
function() {
        var me = this;
        me.direction = Ext.String.toggle(me.direction, "ASC", "DESC");
        me.updateSortFunction();
    }
function() {
        var me = this;
        me.direction = Ext.String.toggle(me.direction, "ASC", "DESC");
        me.updateSortFunction();
    }
Toggles the sorting direction for this sorter.