private bool ExitGraphicRing(GisStructs.MapUnits mapUnits)
{
	bool result = false;
	try
	{
		// New position of the circle's center.
		MapPoint pointGeometry = new MapPoint(mapUnits.Longitude, mapUnits.Latitude);
		if (_ringRange_GO == null)
		{
			Logger.Error("There is not a GraphicsOverlay for:" + mapUnits.UnitTypes.ToString()); ;
			return result;
		}
		var graphics = _ringRange_GO.Graphics.Where(g => (int)g.Attributes["ORDER"] == mapUnits.Order && g.Attributes["TYPE"].ToString() == "RING");
		int x = graphics.Count();
		foreach (var graphic in graphics)
		{
			// RANGE has the diamter of the circle from the center pointGeometry.
			graphic.Geometry = MakeEllipseGeometry(pointGeometry, (int)graphic.Attributes["RANGE"]);
			result = true;
		}
		return result;
	}
	catch (Exception ex)
	{
		Logger.Error("Error:" + ex.Message + "-" + mapUnits.UnitTypes.ToString());
		return result; 
	}
}