title: Error in Silverlight 4 app: Event handler 'True' not found on class 'MyApplication.MainPage'
body: <p>Has anyone ever come across this one? </p>
  
  <p>One second everything works ok, then I get this error out of nowhere. 
  It doesn't make sense, and there's no code/xaml out of place.</p>
  
  <p>Bing/Google searches come up empty.</p>
  
  <p>Visual Studio 2010
  Silverlight 4 application
  VB.NET</p>