Haven't tried it yet but I need to do something similar - what I've thought is to use the MouseDown to log all the points as the user clicks on the map - translate the screen positions to real coordinates using XYToLocation - this provides your location object that can then be added to your own array. Then use the array of location in the AddPolyLine method... well it seems like a good idea :) If I get it working I'll post something.

Andy