title: Mappolyline in WP8 from XAML does not work?
body: <p>all  I am working with WP 8 new Maps from Nokia.
  Having a bit problem with mappolyline from xaml, it won't show.
  Tried (Some init code removed): 
  Where Coords is just a public property of type GeoCoordinateCollection
  I can show the polygon by doing code but that's not what I want now when I have learned about binding code to templates and so on.</p>
  
  <pre><code>&lt;maps:Map x:Name="Map" Grid.Row="1"  &gt;
          &lt;maps:Map.MapElements &gt;
              &lt;maps:MapPolyline StrokeColor="red" StrokeThickness="2" Path="{Binding Coords}"&gt;&lt;/maps:MapPolyline&gt;
          &lt;/maps:Map.MapElements&gt;
  &lt;/maps:Map&gt;
  </code></pre>