<esri:SimpleMarkerSymbol id="bluecircle" size="15" color="0x0000FF" style="circle" alpha="0.5"/> <esri:SimpleMarkerSymbol id="redcircle" size="15" color="0xFF0000" style="circle" alpha="1.0"/> //Initially var g:Graphic = new Graphic(p, bluecircle); //then later g.symbol=redcircle;