Robert,
My scenario is
1.Created basemap with 4 scales only (1:500000,1:200000,1:100000,1:50000).
2.Through query operation(custom tool or widget) i got the feature set (dynamically) . The feature set will have the extent and that extent is not falling into the base map scale. .For example I may get scale for the featureset 1:2500 or 1:7000 or 1:8000 .
3.In that case Can i zoom to 1:2500 or 1:7000 or 1:8000 ? . Is it possible to view the basemap details in 1:2500 or 1:7000 or 1:8000 .
4. The featureset scale 1:2500 or 1:7000 or 1:8000 is not constant , this will vary depends on the user query.