I have been faced with a claim that Apple has disallowed the use of the "close" button in an iPad app. I have read the documentation, and -- though Apple frequently says you should try not to do it, that it frowns on it -- is there any specific statement from Apple that says that developers cannot use a "close" button?
I am not looking for a flame war -- What reference/documentation answers this question?
An app I am developing depends on the concept, so I need to know if I am going to get it rejected on those grounds. Again, I am not looking for opinions, but specific references in the docs, either pro or con.