Use jQuery Validation Engine and Chosen js Together

In my current project, to validate forms in client side, I'm using jQuery Validation Engine. And to prettify select elements I use Chosen js.

Because Chosen js hides real select box and replace it with a pretty select div with search ability, jQuery Validation Engine cannot validate the select elements hidden by Chosen. After googling, I found how to use these both plugin together:

https://github.com/posabsolute/jQuery-Validation-Engine/blob/master/demos/demoChosenLibrary.html

And the solution is simple:

jQuery(document).ready(function() {
    // binds form submission and fields to the validation engine
    jQuery("#formID").validationEngine({
        prettySelect : true,
        useSuffix: "_chzn"
        //promptPosition : "bottomLeft"
    });
    $("#country").chosen({
        allow_single_deselect : true
    });
});

We should add this two new option to make jQuery Validation Engine to work on Chosen.

prettySelect : true,
useSuffix: "_chzn"

But this solution from that page seems not working. After do some research, I found that

useSuffix: "_chzn"

should be changed to

useSuffix: "_chosen"

And it works !