[Solved] PanelBar issue

[reynald lawrence]

Hi to all,

I'm replicating the telerik mvc PanelBar "Binding to Model", but receiving this error: 

CS1502: The best overloaded method match for 'Telerik.Web.Mvc.UI.PanelBarBuilder.BindTo(string, System.Action<Telerik.Web.Mvc.UI.PanelBarItem,Telerik.Web.Mvc.SiteMapNode>)' has some invalid arguments

Here's my panelbar script:
View:

@(Html.Telerik().PanelBar()
        .Name("GeneralDownloads")
        .HtmlAttributes(new { style = "width: 300px;" })
        .BindTo(Model, mappings => 
        {
            mappings.For<Model.ProductGroups>(binding => binding
                    .ItemDataBound((item, productGroup) =>
                    {
                        item.Text = productGroup.ProductName;
                    })
                    .Children(productGroup => productGroup.ProductFiles));
            mappings.For<Product>(binding => binding
                    .ItemDataBound((item, productFiles) =>
                    {
                        item.Text = productFiles.FileName;
                    }));
        })
) 

Hope i can find solution,
Many Thanks!