I start my map in WebMercator and set the basemap using Basemap.CreateTopographicVector(). All displays as expected. I allow my user to select a different spatial reference where I create a new map passing the selected SpatialReference and then add the basemap in the same way as before and the basemap does not display. Is there something else I should be doing to allow for this or are vector basemaps not allowed to reproject? I did this in 10.2.7 fairly easily. Just trying to figure out how to accomplish this in 100.x now.