I have the same issue with 9.1. Would like to see this answered as well.
I have the same issue with 8.3. This is really an important and clear question -
Is there a way to get design-time support for hierarchical data in WebGrid, using CLF 2.0?
Now that version 8.3 is out, does the problem persist?
I too am experiencing this behavior. Neither band populates in Design time with exactly the same data setup as above. If I switch the DataSourceID to either of the ObjectDataSources, the band populates correctly, but when I switch it back to the WHDS, no band data is available in the designer.