<layer label="NRCan" type="wms" skipgetcapabilities="true" url="http://wms.ess-ws.nrcan.gc.ca/wms/toporama_en" version="1.1.1" visible="true" visiblelayers="limits" wkid="900913" />
No, popups are not supported for WMS.
"...the ArcGIS Viewer for Flex supports pop-ups windows for tiled and dynamic map services, as well as feature layers."
http://help.arcgis.com/en/webapps/flexviewer/help/index.html#/Pop_up_configuration_files/01m30000002...
I add code displayed below into config file.
I'm trying to add wms service (wms.ess-ws.nrcan.gc.ca/wms/toporama_en) to my flexviewer 3.0 web application. I add code displayed below into config file. Do I have to do something else to make this service visible?
<operationallayers>
<layer label="NRCan"
type="wms"
skipgetcapabilities="true"
url="http://wms.ess-ws.nrcan.gc.ca/wms/toporama_en"
version="1.1.1"
visible="true"
visiblelayers="limits"
wkid="900913"
/>
</operationallayers>