Client Validation in MVC3 with Gridview Template Form

I am trying to do client-side validation when entering data into a PopupEditForm called from a GridView (there is a custom edit form template). Although I can successfully validate on the server side (against the Model, using DataAnnotations), client side just doesn't seem to be working.
I have looked at Issue B209769 and tried to understand your response, but am having difficulty. On the one hand DevExpress seems to be indicating that normal MVC client-side validation is not compatible with your editors:
"The standard MVC validation mechanism is incompatible with ours. Thus, you cannot use the [Required] Model attribute together with the ASPxClientEdit.ValidateEditorsInContainerById method, because they do not depend on each other.
If you wish to use DevExpress methods to validate MVCx editors, you need to define validation rules at the level of our editors. If you want to use the [Required] Model attribute, call the Model's methods to validate the editors. "
while on the other hand you link to an MVC extensions demo showing Model Validation in MVC3 (under Data Editors) which says:
"The DataAnnotations attributes cause MVC to provide both client and server validation checks with no additional coding. Client-side validation is activated by attaching the necessary JavaScript validation files to a view's master page and calling the Html.EnableClientValidation method within the view. "
I have added the following two lines to my _Layout.cshtml:
    <script src="…/…/Scripts/jquery.validate.min.js" type="text/javascript"></script>
    <script src="…/…/Scripts/jquery.validate.unobtrusive.min.js" type="text/javascript"></script>
added an @{Html.EnableClientValidation();} line at the top of the Partial View containing my GridView (my web.config also has ClientValidationEnabled = true), decorated my model with Data Annotations yet I still can't get the validations working on the client side. Server side is fine, my controller handles the invalid model and reshows the Partial View with the appropriate message. It's just client side that doesn't work.
I'm sure I'm making a simple mistake or perhaps I just don't understand what's going on, I'd just like to be able to get client-side validation working. At the least, could you please point me to an example of it in MVC3/Razor with a GridView and EditTemplateForm? I've looked at the existing Razor example you linked to in the above Issue but that uses a straight HTML form, not a GridView with PopupEdit.
Thanks.