>Given:

 public class LLProduct
>  {
>    public Guid Id { get; set; }
>    public String Name { get; set; }
>  }
>
>  public class ProductsViewModel
>  {
>    public LLProduct Product { get; set; }
>  }

and an MVC action

      Guid id = Guid.NewGuid();
>      List<LLProduct> list = new List<LLProduct>
>        {
>          new LLProduct{Id=Guid.NewGuid(),Name="One"},
>          new LLProduct{Id = id,Name = "Two"}
>        };
>      ViewBag.Selector = new SelectList(list, "Id", "Name");
>
>      var p = new LLProduct();
>      p.Id = id;
> 
>      ProductsViewModel pvm = new ProductsViewModel{Product = p};
>      return View(pvm);

then '@Html.DropDownListFor(x=>x.Product.Id,(SelectList)ViewBag.Selector)
>' selects the right item ("Two")
>
>If, however, I use 'p' as the parameter to the view (and change the model in the cshtml) then '@Html.DropDownListFor(x=>x.Id,(SelectList)ViewBag.Selector) shows "One" (no value selected in the generated html) ?

What do you mean by p as the parameter to the view? What exactly is the problem - the list doesn't show both entries?