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windowDidBecomeMain when app being made active

I have the following code in a window delegate:

- (void) windowDidBecomeMain:(NSNotification *) notification
{
NSWindow *window = [NSApp mainWindow];
DEBUG_ASSERT( window != nil );
}

This code works fine if I switch among windows in my application. However, if I switch to a different app, then switch back, the assertion fires because [NSApp mainWindow] is returning nil. Why is this? If the window "did" become main, shouldn't I get back my window? This happens no matter how I switch back into my app. Clicking a window, the dock icon, etc. Any ideas?

-jim
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