Use Cordova WP8 JsonHelper for deserialize json

In PhoneGap Documentation "Developing a Plugin on Windows Phone" explain how parse simple array of string:

cordova.exec(win, fail, "ServiceName", "MethodName", ["this is a string", "54", "{literal:'trouble'}"]) ;

string[] optValues = JsonHelper.Deserialize(options);

But if you have something more complexity like this:

var moreBtns = 
[
    {
        name  : 'fb button',
        target: 'EXTERNAL',
        url   : 'http://www.facebook.com'
    },
    {
        name  : 'twitter button',
        target: 'EXTERNAL',
        url   : 'http://www.twitter.com'
    }
];
cordova.exec(win, fail, "ServiceName", "MethodName", ["this is a string", "54", moreBtns]) ;

How to parse it? First of all create class for more button

public class moreButtonClass
{
    public string name { get; set; }
    public string target { get; set; }
    public string url { get; set; }
}

and then parse

string[] optValues = JsonHelper.Deserialize(options);

if (optValues.Length > 2)
{
    moreButtonClass[] moreBtns = JsonHelper.Deserialize(optValues[3]);

    for (int i = 0; i < moreBtns.Length; i++)
    {
        Debug.WriteLine("moreBtns[" + i + "][name]=" + moreBtns[i].name);
        Debug.WriteLine("moreBtns[" + i + "][target]=" + moreBtns[i].target);
        Debug.WriteLine("moreBtns[" + i + "][url]=" + moreBtns[i].url);
    }
}