How can I hide an NSToolbarItem using code?

StackOverflow https://stackoverflow.com/questions/4963279

문제

I have a toolbar with various options and some options should not be visible in some cases. I have already figured out a way to disable them in my application, using this callback:

  - (BOOL) validateToolbarItem: (NSToolbarItem *) toolbarItem

But I haven't figured out a way to really hide them when I need. Anyone has any ideas on how to do this or if it's really possible at all?

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