I have set the Map.WrapAround property to true, the user can draw a polygon and the result of this is set as the FeatureLayer.Geometry property, FeatureLayer.Update() is then called. This returns the correct results.
If the user then pans the original world frame a couple of times to the left or right passing the dateline and the process as above is completed the FeaturLayer returns no results.
Ok it works with a simple polygon, but if the geometry is a circle or a freehand line that has been closed to make a polygon it produces no results once the map has panned beyond the dateline.