<basemaps> <layer label="Streets" type="bing" visible="false" style="road" culture="en-US"/> <layer label="Aerial" type="bing" visible="true" style="aerial" culture="en-US"/> <layer label="Aerial with labels" type="bing" visible="false" style="aerialWithLabels" culture="en-US"/> </basemaps>
The Bing type does not require a url. Here's the direct link to the main configuration file (for the Bing sample):
http://help.arcgis.com/en/webapps/flexviewer/samples/config-bing.xml<basemaps> <layer label="Streets" type="bing" visible="false" style="road" culture="en-US"/> <layer label="Aerial" type="bing" visible="true" style="aerial" culture="en-US"/> <layer label="Aerial with labels" type="bing" visible="false" style="aerialWithLabels" culture="en-US"/> </basemaps>