Groups doesn't work for grid with VS 2013

[Emmanuel]

Hi guys,

I simply modified the last version of samples (grid/index.chtml), in order to test a grouping configuration as described in documentation.
But the Groups property does not exist.
Here the code below:

@model Kendo.Mvc.Examples.Models.HeaderTemplateViewModel
@{using (Html.BeginForm())
  {          
    @(Html.Kendo().Grid(Model.Products)
        .Name("Grid")
        .Columns(columns =>
        {
            columns.Template(@<text>
                     <input name="selectedProducts" type="checkbox" title="select product" value="@item.ProductID"
                     @{
                         if (Model.SelectedProducts.Any(p => p.ProductID == item.ProductID))
                         {
                            @("checked=checked")
                         }
                     }/>
                    </text>)
                .HeaderTemplate(@<text>
                        <input id="selectAllProducts" type="checkbox" title="select all"
                          @{
                              if (Model.SelectedProducts.Any())
                              {
                                @("checked=checked")
                              }
                           } />
                    </text>)
                .Width(50)
                .HtmlAttributes(new { style = "text-align:center" })
                .HeaderHtmlAttributes(new { style = "text-align:center" });
            columns.Bound(p => p.ProductName);
            columns.Bound(p => p.UnitPrice);
            columns.Bound(p => p.UnitsInStock);
        })
        .Pageable()
                                      .Groupable(grouping => grouping
                                            .Groups(groups =>
                                            {
                                                groups.Add(p => p.ProductName);
                                            })
                                      )
    )
    <p>
        <button class="k-button">
            Display selected products</button>
    </p>    
  }   
}

Version: 2014.1.528.545 Dev

Thanks for helping

[Emmanuel]

My mistake.
It does not exist in Kendo UI documentation