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When a custom basemap is added to the Viewer for Flex application with a different tiling schema, the basemaps cannot display on top of each other.
ArcGIS Online basemaps are tiled services with a defined tiling scheme and fixed levels of detail. If the custom basemap is a dynamic service, a conflict occurs that prevents the ArcGIS Online basemaps from displaying when the user selects a basemap.
Using the same tiling scheme as the basemaps, publishing the custom basemap as a tiled service and adding the basemap to Viewer for Flex allows the different basemaps to coexist.