Shows all sprites. If `true` is passed then a redraw will be forced for each sprite.
@param {Boolean} redraw Flag to immediately draw the change.
@return {Ext.draw.CompositeSprite} this
function(redraw) {
        var i = 0,
            items = this.items,
            len = this.length;
            
        for (; i < len; i++) {
            items[i].show(redraw);
        }
        return this;
    }