title: Install custom Behaviour in Expression Blend 4
body: <p>I have Blend 4 installed and noticed that it didnt include a GoToNextState or GoToPrevState behaviour by default. </p>
  
  <p>I have been given a DLL called GotoStateActions, but i dont know what to do with it.</p>
  
  <p>This should include the missing states, but how do i 'install' them?</p>