A slide connector apparatus for attaching a rail to an upright includes a first part adapted to be secured to the rail and having a first engagement element, and a second part adapted to be secured to the upright and having a second engagement element. The first and second engagement elements are movable along an engagement axis from a disengaged position, in which the first and second parts are generally free to move relative to each other, to an engaged position in which the first and second parts are substantially inhibited from moving relative to each other.