title: Extension Manager calls load events only once in Visual Studio 2015
body: <p>I want to hook up to any kind of event triggered before the Extension Manager is loaded (Loaded, Activated, etc.), using Handlers to execute methods I wrote.</p>
  
  <p>I tried all of them, and they get executed when the Extension Manager is rendered the first time. However, if I close it and open it again, the events are not triggered. </p>
  
  <p>Is this common behavior in VS2015 (unlike in previous versions)? Is there any workaround to solve this?</p>