http://help.arcgis.com/EN/webapi/javascript/arcgis/demos/identify/identify_drilldown.html
If you click, nothing happens. If you look you'll see it's making AJAX calls, and the response is always:
dojo.io.script.jsonp_dojoIoScript17._jsonpCallback({"error":{"code":500,"message":"Server Error - Object reference not set to an instance of an object.","details":[]}});
The service that this sample uses has been deprecated. I'll replace the service and upload a new version of the identify sample soon.