If I add an item to an ObservableCollection that's already been bound to the VisualizationLayer.ItemsSource, the item won't appear on the map where it should. Instead, it displays the item at lat:0, long:0 in the middle of the map. This happens when the map is zoomed in and you add an item.
Interestingly, if I first zoom the map out to the world view and then add the item, the item appears where it should. It's almost like RadMap needs the middle of the map (0,0) to be visible for new items to get displayed in the correct location.
Steps to reproduce:
1. Create an ObservableCollection with some items and set it to the VisualizationLayer.ItemsSource.
2. Zoom in somewhere so the middle of the map (0,0) is not visible. A local city works fine.
3. Add an item to the ObservableCollection.
Result: The item won't appear where it should on the map, instead it appears at 0,0 which you can see when you zoom out.