https://resources.arcgis.com/en/help/arcobjects-net/componentHelp/0036/0036000001p9000000.htm
INAStopRenderer.ErrorSymbol Property (ArcObjects .NET 10.1 SDK)
propertysdk
https://resources.arcgis.com/en/help/arcobjects-net/componentHelp/0036/0036000001pq000000.htm
INAStopRenderer.UnlocatedSymbol Property (ArcObjects .NET 10.1 SDK)
propertysdk