Commented Issue: System.ArgumentException: Cannot add instance of type 'PopupFocusManagerBehavior' to a collection of type 'BehaviorCollection' [1374]

Since yesterday I get the following error and can't load the extension anymore (happens even when no solution is open):

```
ResX Resource Manager loaded.
Home: http://resxresourcemanager.codeplex.com/
Report issues: http://resxresourcemanager.codeplex.com/workitem/list/basic
Support the project by adding a short review: http://visualstudiogallery.msdn.microsoft.com/3b64e04c-e8de-4b97-8358-06c73a97cc68
Assembly location: C:\Users\USER\AppData\Local\Microsoft\VisualStudio\12.0\Extensions\okd2alou.yy2
Error: System.Windows.Markup.XamlParseException: Add value to collection of type 'System.Windows.Interactivity.BehaviorCollection' threw an exception. ---> System.ArgumentException: Cannot add instance of type 'PopupFocusManagerBehavior' to a collection of type 'BehaviorCollection'. Only items of type 'T' are allowed.
at System.Windows.FreezableCollection`1.Cast(Object value)
at System.Windows.FreezableCollection`1.System.Collections.IList.Add(Object value)
at System.Xaml.Schema.XamlTypeInvoker.AddToCollection(Object instance, Object item)
at MS.Internal.Xaml.Runtime.ClrObjectRuntime.Add(Object collection, XamlType collectionType, Object value, XamlType valueXamlType)
--- End of inner exception stack trace ---
at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
at System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri)
at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
at tomenglertde.ResXManager.View.Visuals.Shell.InitializeComponent()
at tomenglertde.ResXManager.VSIX.MyToolWindow.OnCreate()
```
Comments:

I could not reproduce this, but I once had a similar problem when an assembly was only referenced by XAML but not by code, so I guess adding an expicit reference in code to 'System.Windows.Interactivity' shuld fix this.

Can anyone give me some feedback if this has worked?