SetPromptStyle to CURSOR

Hello
What exactly does RPCManager.setPromptStyle(PromptStyle.CURSOR) do? I set it for a form’s data source and the ‘Saving Data’ dialog went away but no progress of any sort is now indicated?
I’d like to show a ‘Saving..’ message show up masking entire form. How do we do that? I don’t see a ‘mask’ or similar operation on Widget. Any ideas?

Thanks