You can get the clicked PolylineData in the MapMouseClick event handler of the RadMap control. Here is an example:
sender, Telerik.Windows.Controls.Map.MapMouseRoutedEventArgs eventArgs)
var itemsInLocation =
var clickedItem = itemsInLocation.Last();
I get the last item from the items in the clicked location because there could be several polylines. If so, there won't be clear which one is clicked. To determine that you can get the element with the highest ZIndex and if all have the same ZIndex you can get the last one in the collection. This will be the item that is at the top of the order stack of the visual tree.
As a side note, the GetItemsInLocation() method is located in the VisualizationLayer class.
Please try this approach and let me know if it works for you.
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