Iterates through all sprites calling `setAttributes` on each one. For more information {@link Ext.draw.Sprite}
provides a description of the attributes that can be set with this method.
@param {Object} attrs Attributes to be changed on the sprite.
@param {Boolean} redraw Flag to immediately draw the change.
@return {Ext.draw.CompositeSprite} this
function(attrs, redraw) {
        var i = 0,
            items = this.items,
            len = this.length;
            
        for (; i < len; i++) {
            items[i].setAttributes(attrs, redraw);
        }
        return this;
    }