ASP.NET MVC 2 - POST Form Model From PartialView?

I have a single model type to wrap up various models I want to use in my view:

public class QuestionViewData {
public Question Question { get; set; }
public IList<Answer> Answers { get; set; }
}

Now, in my question view I pull the data from the Question object - that's fine. Secondly I iterate through all Answer objects and pass them to a partial view:

<% foreach(Answer item in Model.Answers) { %>
<% Html.RenderPartial("ShowAnswer", item); %>
<% } %>

For each answer (in the partial view) I have some action buttons (like ratings). I'm using separate form POST's with hidden fields for every button. The problem is that I can't post the whole QuestionViewData model to my action method cause I only have the Answer object as model in the partial view. However, I need to return the complete question view from that action that takes QuestionViewData as model.