Customizing Save panel

FROM : Paul J. Lucas
DATE : Thu Aug 03 20:11:46 2006

I have a customized NSSavePanel that offers the user more
   options for saving a document.  I have the custom stuff in a
   nib file.  One of the custom items is a pop-up menu.  For one
   selection of the menu, there are no additional user-settable
   controls; for the other selections, there are more controls.

   The way I have been doing this is to have a Custom View object
   and then programmatically swapping the contents of the custom
   view.

   In peeking at other Mac applications, e.g., Safari, it has each
   set of preferences as a seperate nib file.

   So I'm wondering: is it better to do what I'm doing (have custom
   and seperate views in the same nib file) or have a different nib
   file for each view?

   It would also be nice to have it so that the view switching
   happens allo inside the nib and that I programatically don't
   have to do anything.

   Advice?  Examples?

   - Paul