I posted an answer to Delegate Methods not called in Class Instance.
The author has left a comment in my answer asking "will you take your answer down so it looks unanswered".
First off, I'm not sure why it is important to have an unanswered question, but second off I'm a bit miffed that my attempt at troubleshooting his problem is not welcome. It doesn't encourage me to help answer this question any further.
Is it a common practice to delete one's answers at the request of the author? Many questions here have multiple answers that incrementally solve or answer the question. Isn't that the whole point of asking a question, to get answers?