VS.NET 2015 with Update 3, .NET Core 1.1.0 Razor Tag Helpers do not get colorization

Hi,
After upgrading my project to .NET Core 1.1.0, Razor Tag Helpers do not get colorization or special IntelliSense at design time.  They work normally at runtime.

global.json file:

{"projects": [ "src", "test" ],"sdk": {"version": "1.0.0-preview2-1-003177"
  }
}

project.json file:

{"buildOptions": {"emitEntryPoint": true,"preserveCompilationContext": true
  },"dependencies": {"BundlerMinifier.Core": "2.2.306","jQuery.UI.Combined": "1.12.1","Microsoft.ApplicationInsights.AspNetCore": "1.0.2","Microsoft.AspNetCore.Authentication.Cookies": "1.1.0","Microsoft.AspNetCore.Diagnostics": "1.1.0","Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore": "1.1.0","Microsoft.AspNetCore.Identity.EntityFrameworkCore": "1.1.0","Microsoft.AspNetCore.Mvc": "1.1.0","Microsoft.AspNetCore.Mvc.TagHelpers": "1.1.0","Microsoft.AspNetCore.Razor.Design": "1.1.0-preview4-final","Microsoft.AspNetCore.Razor.Tools": "1.1.0-preview4-final","Microsoft.AspNetCore.Server.IISIntegration": "1.1.0","Microsoft.AspNetCore.Server.Kestrel": "1.1.0","Microsoft.AspNetCore.Session": "1.1.0","Microsoft.AspNetCore.StaticFiles": "1.1.0","Microsoft.EntityFrameworkCore": "1.1.0","Microsoft.Extensions.Configuration.EnvironmentVariables": "1.1.0","Microsoft.Extensions.Configuration.Json": "1.1.0","Microsoft.Extensions.Configuration.UserSecrets": "1.1.0","Microsoft.Extensions.Logging": "1.1.0","Microsoft.Extensions.Logging.Console": "1.1.0","Microsoft.Extensions.Logging.Debug": "1.1.0","Microsoft.Extensions.Options.ConfigurationExtensions": "1.1.0","Microsoft.NETCore.App": "1.1.0","Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.1.0","Microsoft.VisualStudio.Web.CodeGeneration.Tools": "1.1.0-preview4-final","Microsoft.VisualStudio.Web.CodeGenerators.Mvc": {"version": "1.1.0-preview4-final","type": "build"
    },"Newtonsoft.Json": "9.0.1","NonFactors.Grid.Mvc6": "1.3.0","Npgsql.EntityFrameworkCore.PostgreSQL": "1.1.0"
  },"frameworks": {"netcoreapp1.1": {"imports": ["dotnet5.6","portable-net45+win8"
      ]
    }
  },"publishOptions": {"include": ["wwwroot","Views","Areas/**/Views","appsettings.json","web.config"
    ]
  },"runtimeOptions": {"configProperties": {"System.GC.Server": true
    }
  },"runtimes": {"win10-x64": {}
  },"scripts": {"prepublish": [ "bower install", "dotnet bundle" ],"postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
  },"tools": {
  },"userSecretsId": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
}

_ViewImports.cshtml :

@using iCRM_Web
@using iCRM_Web.Models
@using iCRM_Web.Models.AccountViewModels
@using iCRM_Web.Models.ManageViewModels
@using Microsoft.AspNetCore.Identity
@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

@inject Microsoft.ApplicationInsights.Extensibility.TelemetryConfiguration TelemetryConfiguration

Any help will be much appreciated,

AG