C# - Using Xval To Client Side Validate Forms?

I am using ASP.NET MVC2 and to validate the forms i use xVal. It seems like the server side validation works fine, but the client side validation doesnt work or atleast doesn't show up.

The code i use looks like this:

<% using (Html.BeginForm()) {%>
div class="label"><label for="EmailAddress">Email Address</label></div>
<div class="field">
<%= Html.TextBox(Prefix + ".EmailAddress")%>
<%= Html.ValidationMessage(Prefix + ".EmailAddress")%>
</div>
<%}%>
<%= Html.ClientSideValidation<Customer>(Prefix)%>

When i remove the prefix it works fine. But when i remove it only the server side validation works.

Searching on xVal on this side i found this post that looks a bit like the same problem: [URL]