Plugin override View, Namespace dosnt exist

Hi Guys

Need some help!
I've created a plugin, based on technics discussed in this forum. I need to override the ProductTemplate-View from a plugin.

Everything seems to work fine until the rendering of the View.

I get the error:  'System.Web.Mvc.HtmlHelper<Nop.Web.Models.Catalog.ProductDetailsModel>' does not contain a definition for 'AddTitleParts' and no extension method 'AddTitleParts'

Also in my view i do not have access to "Using" the Nop.Core or Nop.Web (I have them referenced)
Resulting in error: "the type or namespace 'Web' does not exist"

Do you have any solution for this?
Thanks!