Delegate of window in document-base application

[Yen-Ju Chen]

Hi,

 In Document-base appliction, the relationship is

 NSDocumentController (newDocument:, openDocument:, etc.)
  |
 NSDocument (saveDocument:, saveDocumentTo:,  etc)
  |
 NSWindowController
  |
 NSWindow

 And I notice that *only if* the NSDocument (or subclass) is the delegate 
of NSWindow,
 the menu "Save...", "Save To..." will be enabled.
 If I set NSWindowController as the delegate of NSWindow,
 the menu "Save..." won't be enabled.

 Is it a corrected behavior ?
 That means NSDocument must be the delegate of NSWindow,
 and NSWindowController can't be the delegate.
 The role of "owner" and "delegate" of window in document-base application
 is not very clear.
 What's the owner for ? Does it do anything internally,
 or just a convenient outlet ?

 Yen-Ju

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