Brandon,
The way to obtain user interaction with the map is via the various Track... methods on the MapDisplay class. At the current 1200 release these are TrackPoint, TrackPolygon, TrackPolyline, and TrackVector. In the next release (1500) due out this summer we have added some additional Track... methods for other types of shapes. There are no generic mousedown events exposed. You can also use MapDisplay.GraphicClicked and MapDisplay.MapItemClicked (notes and KML layers only).
Regards
Mike