How to call this.remote inside .then()

Question

If I have something like

return this.remote
    .findByXpath('xpath to open menu').click().end()
    .then(function() {
        // check menu items
        ...
        return this.remote
            .findByXpath('xpath to close menu').click.end()
    });

It gives me an ECONNREFUSED error. How do I nest calls with the this.remote Command object?