Here is another 'tell me about' question. You will have to think of an example of your own. The items you need to include in your answer should consist of you showing proper communication, taking appropriate action, and ending with a good outcome. It's perfectly natural to disagree with your boss. It is important how you react when you have a disagreement. Show the interviewer that you are professional about disagreements.
I know this answer is long, but all types of 'tell me about' questions are long. You have to tell a story in the shortest way for them to understand while explaining the disagreement along with the outcome. It's a huge question and it will take a long time to master 'tell me about' questions. That is why you should diligent on these types of questions.