I was looking at ArcIMSMapServiceLayer documentation: [HTML]<esri:Map> <esri:ArcIMSMapServiceLayer serviceHost="http://www.geographynetwork.com" serviceName="Census_TIGER2000"> <s:ArrayCollection> <esri:visibleLayers> <fx:String>Oceans and Seas</fx:String> <fx:String>Countries and Regions</fx:String> </esri:visibleLayers> </s:ArrayCollection> </esri:ArcIMSMapServiceLayer> </esri:Map>[/HTML]I tried and I think it should be like this. [HTML] <esri:Map> <esri:ArcIMSMapServiceLayer serviceHost="http://www.geographynetwork.com" serviceName="Census_TIGER2000"> <esri:visibleLayers> <s:ArrayCollection> <fx:String>Oceans and Seas</fx:String> <fx:String>Countries and Regions</fx:String> </s:ArrayCollection> </esri:visibleLayers>