title: wp7: in page Loaded event, bing map is null
body: <p>I just updated a 7.0 app to 7.1 and having an interesting issue with Bing Map control.</p>
  
  <p>I am trying to reference the map control during the Page's Loaded event but the map control is null.</p>
  
  <p>It is my understanding that by the time the Page's Loaded event occurs, all controls on the page should also have loaded.  I also call 'ApplyTemplate()' in the loaded event to ensure that templates have been loaded.</p>
  
  <p>I know this description is kind've brief and I'd be glad to supply more details if they would help.</p>