accessing/setting file name for NSSavePanel

[Riccardo Mottola]

Hi,

I want to manipualte the filename of a NSSavePanel while it is shown. 
The events of the manipulation come from the accessoryview. I want to 
read it, modify it and set it back depending on events coming from the 
accessory view components.
How can I do that? The documentation says that "filename" should be used 
only at the end of the modal session and I understand the events coming 
from the controls inside the accessoryviews are during a modal session.
Furthermore I found no provision on how to set the filename.

Any suggestions? The best solution would be portable to Mac, so I'd 
prefer not to use internal variables/methods.

Thank you,
   Riccardo