title: Non-Generic CompositePresentationEvent and EventSubscription?
body: <p>I am trying to create a <code>TPayLoad</code>-free <code>CompositePresentationEvent</code>, that its delegate is parameterless.</p>
  
  <p>I want to have a global application event that takes no parameters such as <code>UserLoggedInEvent</code>, <code>UserGotIdleEvent</code> etc. etc.</p>
  
  <p>How should this be done with the Prism 4.0 event aggregation system?</p>