When a point is about to be inserted this property needs some initial value. The default initial value is the same point as the first/last point, when inserted before the first or after the last point, and the middle point of the intervall where the point is to be inserted. If you wisch another behaviour add a handler to this event and return the appropriate point.

public MultiGeoPointProperty..::..GetInsertionPointDelegate GetInsertionPointEvent

Public GetInsertionPointEvent As MultiGeoPointProperty..::..GetInsertionPointDelegate

public:
MultiGeoPointProperty..::..GetInsertionPointDelegate^ GetInsertionPointEvent