Custom Basemaps in Flex Viewer Linked to ArcGIS Online

Hello, all! Does anyone know how to add custom basemaps to a Flex viewer that is linked to an ArcGIS Online map? I have linked my ArcGIS Online and Flex maps as described in this post: http://blogs.esri.com/esri/arcgis/20...ewer-for-flex/

Unfortunately, now that my Flex viewer is linked to ArcGIS Online, my custom basemaps will no longer display in the Flex viewer. It seems that the default basemaps from ArcGIS Online override my custom basemaps -- even though the custom basemaps are still defined in my Flex viewer configuration file.

I am able to add one custom basemap to my Flex viewer by adding the basemap service to my ArcGIS Online map. However, this only works with a single custom basemap. Also, I am then stuck using the custom basemap as the basemap for my ArcGIS Online map, which is not what I want.

Has anyone else experienced this? Any advice?

Thanks,
Alexandra