MVC3 RadioButton Helper with many independent groups

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C#

MVC3

I want to display under each name from the table radio group relating to this name.
Now, I slightly modified Lanceley’s example (http://jonlanceley.blogspot.ru/2011/06/mvc3-radiobuttonlist-helper.html[^]). But I have to pre-create so many special fields in model as radio units I want to display.
In other case groups are coupled.
How can I solve this problem?
From view:

@model IEnumerable<Sample.Models.IndexViewModel>
…
    int i=0;
    for (i = 0; i < Model.Count();i++ )
    {
     @Html.DisplayTextFor(m => m.ElementAt(i).Name)   
     @Html.RadioButtonForSelectList(m => m.ElementAt(i).TestRadio, Model.ElementAt(i).TestRadioList)
    }

From model:

public class IndexViewModel
    {
        public IEnumerable<SelectListItem> TestRadioList { get; set; }
        public String Name { get; set; }

        [Required(ErrorMessage = "You must select an option for TestRadio")]
        public String TestRadio { get; set; }
        [Required(ErrorMessage = "You must select an option for TestRadio2")]
        public String TestRadio2 { get; set; }
        [Required(ErrorMessage = "You must select an option for TestRadio3")]
        public String TestRadio3 { get; set; }

	…
    }

From helper:

public static class HtmlExtensions
{
    public static MvcHtmlString RadioButtonForSelectList<TModel, TProperty>(
        this HtmlHelper<TModel> htmlHelper,
        Expression<Func<TModel, TProperty>> expression,
        IEnumerable<SelectListItem> listOfValues)
    {
        var metaData = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
        var sb = new StringBuilder();

        if (listOfValues != null)
        {
            // Create a radio button for each item in the list
            foreach (SelectListItem item in listOfValues)
            {
                // Generate an id to be given to the radio button field
                var id = string.Format("{0}_{1}", metaData.PropertyName, item.Value);

                // Create and populate a radio button using the existing html helpers
                var label = htmlHelper.Label(id, HttpUtility.HtmlEncode(item.Text));
                var radio = htmlHelper.RadioButtonFor(expression, item.Value, new { id = id }).ToHtmlString();

                // Create the html string that will be returned to the client
                // e.g. <input data-val="true" data-val-required="You must select an option" id="TestRadio_1" name="TestRadio" type="radio" value="1" /><label for="TestRadio_1">Line1</label>
                sb.AppendFormat("<div class=\"RadioButton\">{0}{1}</div>", radio, label);
                i++;
            }
        }