title: WCF RIA Services -- take action when all data is loaded
body: <p>So, I am just getting started with .WCF RIA Services and Silverlight.  </p>
  
  <p>Here's what I need to do:
  I need to make a couple of calls to my domain service to load data.  So, I'm using the Load() method on the Context object.</p>
  
  <p>I need to take some action when all of the queries have completed.  I see that I can specify a callback for each individual load, but what I really want to do is to register a callback that will be executed when all of the loads are complete.</p>
  
  <p>Is there a built-in way to do this with RIA services/Silverlight, or will I need to roll my own?</p>
  
  <p>BTW:  I'm not doing anything all that crazy -- I just don't want my form to be interactive until the data is loaded (I don't want to block the UI thread, I just want to show a progress bar/dancing hampster until all the data is loaded)</p>