Un-highlight any existing highlights
function() {
        if (!this.highlight || !this.items) {
            return;
        }

        var me = this,
            items = me.items,
            len = items.length,
            opts = Ext.merge({}, me.highlightCfg, me.highlight),
            animate = me.chart.animate,
            i = 0,
            obj, p, sprite;
        for (; i < len; i++) {
            if (!items[i]) {
                continue;
            }
            sprite = items[i].sprite;
            if (sprite && sprite._highlighted) {
                if (sprite._anim) {
                    sprite._anim.paused = true;
                }
                obj = {};
                for (p in opts) {
                    if (Ext.isObject(sprite._defaults[p])) {
                        obj[p] = Ext.apply({}, sprite._defaults[p]);
                    }
                    else {
                        obj[p] = sprite._defaults[p];
                    }
                }
                if (animate) {
                    //sprite._to = obj;
                    sprite._endStyle = obj;
                    sprite._anim = new Ext.fx.Anim({
                        target: sprite,
                        to: obj,
                        duration: 150
                    });
                }
                else {
                    sprite.setAttributes(obj, true);
                }
                delete sprite._highlighted;
                //delete sprite._defaults;
            }
        }
    }