Change the value of Chosen.js select box using jQuery

I'm trying to change the value of my select box which has Chosen.js overlay. The idea is to change the selected value when user clicks a button.

With regular select box I can change the value by doing:

$('#GroupsShowNext').unbind("click").click(function() {
    var index = $("#GroupsViewGroups").prop("selectedIndex");
    index += 1;

    $('#GroupsViewGroups option').eq(index).attr('selected', 'selected');
    $('#GroupsViewGroups').change();
});

But with Chosen.js it doesn't work anymore..I have tried few things but nothing has worked. Any ideas how to get it work?

Fiddle