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[MatuX]

I was reading a code example from a book when I found this:

	
[self.navigationItem setRightBarButtonItem:[[[UIBarButtonItem alloc]
	initWithTitle:@"Randomize"
	style:UIBarButtonItemStylePlain
	target:self
	action:@selector(randomizePositions)] autorelease]];

If I do a refcount or retainCount for self.navigationItem.rightBarButtonItem it shows that it has 3 references!
Why? Should I care?
Why do I have to write autorelease there?
What if I don't?
When do I know I should call autorelease?

Best regards,
Matias