title: using xBind with MapElementLayer
body: <p>Let's say I have two classes: 
  Paths and Pins, that I want to represent on the map. Both are POCOs with latitude and longitude. 
  What's the best way to create two layers of MapElements that I can display on the map independently? </p>
  
  <p>Currently I manually create an ObservableCollection of MapElements for each type of items I wish to display on the map. Then I populate the collection with MapElements using data from POCOs</p>
  
  <p>The problem is that, when position of one of these items updates, I have to manually update each MapElement.
  Is it possible to use xBind to update each mapelement? For example by generating a collection of MapElements in XAML? </p>