title: MapControl.ActualCameraChanged doesn't always trigger
body: <p>I'm working on a UWP project where I render 3D content on top of a tilted BingMaps map.</p>
  
  <p>I'm rendering my 3d content using directx in a seperate (partially transparent) control that lies on top of the map. So it's not rendered within or as part of the mapcontrol or anything, it's completely seperate. </p>
  
  <p>In order to (try to) make the 3d-camera match the map-camera, I use the ActualCameraChanged event to determine when to update and render my 3d camera.</p>
  
  <p>Now I noticed that sometimes when I start the map, the ActualCameraChanged-event is never triggered. I get no warnings or errors or nothing, everything seems to work fine, but the event just doesn't get triggered.</p>
  
  <p>Does anyone have any idea what could cause this?</p>