You may wonder how to abort tracking a shape such as a polygon on the map. In Map Suite 2.x, you would press the Esc key and the tracking operation would stop. In 3.x, this is not possible yet with TrackOverlay but it will be added in the future in our core Desktop product. In the meantime, I propose to check the project in our Code Community that shows how to do that with some added code.
code.thinkgeo.com/projects/show/cancelingtrack