BalloonPushPinPreferredLocation Field

public BalloonLocation PreferredLocation

Public PreferredLocation As BalloonLocation

BalloonPushPin myPin = new BalloonPushPin(new LatLon(33.584224, -117.737976));

// Place the balloon to the bottom-right (assuming the map is aligned north) of the pushpin
myPin.PreferredLocation = BalloonLocation.SouthEast;

// to show the BalloonPushPin, add it to your Map's RenderList
myRendererList.Add(myPin);