title: The name ViewModelLocator does not exist in the namespace
body: <p>I'm learning WPF with MVVM Light and i've an issue with my Portable Class Library.
  I follow this tutorial: <a href="http://www.codeproject.com/Articles/536494/Portable-MVVM-Light-Move-Your-View-Models" rel="noreferrer">http://www.codeproject.com/Articles/536494/Portable-MVVM-Light-Move-Your-View-Models</a></p>
  
  <p>I created a portal class library and a WPF mvvm light 4.5 with reference of MVVM Light.
  I've added the reference of my PCL in my wpf project.
  So in my PCL, i've added a folder ModelView and inside my ModelViewLocator</p>
  
  <pre><code>using GalaSoft.MvvmLight;
  using GalaSoft.MvvmLight.Ioc;
  using Microsoft.Practices.ServiceLocation;
  using EasyDevis.EasyDevisPCL.Model;
  using EasyDevis.EasyDevisPCL.ViewModel.MainPage;
  
  namespace EasyDevis.EasyDevisPCL.ViewModel
  {
  /// &lt;summary&gt;
  /// This class contains static references to all the view models in the
  /// application and provides an entry point for the bindings.
  /// &lt;para&gt;
  /// See http://www.galasoft.ch/mvvm
  /// &lt;/para&gt;
  /// &lt;/summary&gt;
  public class ViewModelLocator
  {
      static ViewModelLocator()
      {
          ServiceLocator.SetLocatorProvider(() =&gt; SimpleIoc.Default);
          SimpleIoc.Default.Register&lt;MainPageViewModel&gt;();
      }
  
      /// &lt;summary&gt;
      /// Gets the Main property.
      /// &lt;/summary&gt;
      [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance",
          "CA1822:MarkMembersAsStatic",
          Justification = "This non-static member is needed for data binding purposes.")]
      public MainPageViewModel MainPageViewModel
      {
          get
          {
              return ServiceLocator.Current.GetInstance&lt;MainPageViewModel&gt;();
          }
      }
  
      /// &lt;summary&gt;
      /// Cleans up all the resources.
      /// &lt;/summary&gt;
      public static void Cleanup()
      {
      }
  }
  }
  </code></pre>
  
  <p>The issue come in my app.xaml and the namespace is correct because of intelisense propose me the path.</p>
  
  <pre><code>&lt;Application x:Class="EasyDevis.App"
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
           xmlns:vm="clr-namespace:EasyDevis.EasyDevisPCL.ViewModel"
           xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
           xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
           StartupUri="Content/MainPage/View/MainPageView.xaml"
           mc:Ignorable="d"&gt;
  
      &lt;Application.Resources&gt;
          &lt;!--i've the error on this line--&gt;
          &lt;vm:ViewModelLocator x:Key="Locator" d:IsDataSource="True" /&gt;
      &lt;/Application.Resources&gt; 
  
  &lt;/Application&gt;
  </code></pre>
  
  <p>Do you have an idea of what i did wrong?</p>