Hello Mike Chabot,
Adding a RadProgressArea to the RadFileManager would require registering an HTTP handler in the Web.config - which would add one (unintuitive) step
to the RadFileExplorer usage. We would certainly love to do it, though - and it is on our TODO list of features (if we succeed implementing a graceful fallback solution when the handler is not registered).
At present, unfortunately I am not able to be more specific and suggestlikely deadline for this feature.
the Telerik team