gistfile1.txt

      var outline = new esri.symbol.SimpleLineSymbol("solid", new dojo.Color('#777'), 1);
      var fill = new esri.symbol.SimpleFillSymbol("solid", outline, new dojo.Color('rgb(68, 68, 68)'));
      var renderer = new esri.renderer.SimpleRenderer(fill);

      var basemap = new esri.layers.ArcGISDynamicMapServiceLayer("http://ec2-107-21-212-168.compute-1.amazonaws.com:6080/arcgis     /rest/services/WorldBase/MapServer/", {
        id: "basemap",
        visible: false
      });
      basemap.setVisibleLayers([2]);
      Composer.map.addLayer( basemap );
      
      var optionsArray = [];
      var drawingOptions = new esri.layers.LayerDrawingOptions();
      drawingOptions.renderer = renderer;
      console.log('drawingOptions', drawingOptions) 
      
      optionsArray[2] = drawingOptions;
      
      Composer.map.getLayer("basemap").setLayerDrawingOptions(optionsArray);
      Composer.map.getLayer("basemap").show();