title: WPF Designer Error
body: <p>Every time i edit a control or Item using the designer, or code.. The designer gives an exception, yet if i reload the designer it shows the view again, in design view. Then when editing it will, show the same error once again. .. And i can't figure out why it does it at all! Becoming a bit frustrating to say the least. Link below shows the error i receive
  <a href="https://www.dropbox.com/s/d49ahlcf33efegr/wpfDesigner.PNG" rel="nofollow">https://www.dropbox.com/s/d49ahlcf33efegr/wpfDesigner.PNG</a></p>