When using MapArcSementView , setting SweepDirection="ClockWise" does not work. The arc is always CounterClockWise.
Currently only Mercator projection is supported. We should add support for other projections. Shape file reader should be able process .prj file and setup correspondent projection to the EmptyProvider. The Bing and OpenStreet map providers show map using Mercator projection, so they can't use any other projections to show map shapes (KML or ESRI).
MapQuest provides two different API's: one for open use and one for licensed use. Both require a key, so I don't know if there's any difference in the function calls besides the key? Directions, Search, Geocode, etc are available and provide a free alternative to Bing.
When the selection is started on map control then it can be cancelled using the Escape key.
When the PathData contains Arc segment which looks as vertical half-circle then it is not displayed in VisualizationLayer.