Asp.net mvc - Partial View

Hi 

I work wiht ASP.NET MVC4 wiht view engine razor
How configure ckeditor in partial view?

I added in the _Layout.cshtml:

<script src="@Url.Content("~/Scripts/ckeditor/ckeditor.js")" type="text/javascript"></script>

In mya partial view I added this:

@Html.TextAreaFor(model => model.sde_descripcion, new { @class="ckeditor", @id="text-details"})

In my model :

[AllowHtml]
public string sde_descripcion { get; set; }

but in partial view don't show me the ckeditor. Only textare no ckeditor

How I can resolve this problem?