I have updated CPSavePanel to accept a document via it's class method
(now savePanelForDocument:). I don't know if this is the best way to
implement this functionality but there doesn't seem to be a good way
to call proposedFileURLWithDocumentName: since it is setup to call
from a CPSavePanel.
Commit:
http://github.com/sethtrain/cappuccino/commit/85842a3c8afc6987e8c2b7218e78502741323a65
Please advise if I'm not following a guideline by renaming the class
method.