yes, I agree with the different responses basically Control Plan is a tool used to define all the controls you have established to ensure the critical- significant process- product characteristics are being "controlled" all the time--- CUSTOMER SATISFACTION.
You can have a lots of examples but you and your customer needs to tailor it according your needs.
If somehow your customer is telling you your control plan is not effective enough you need to work with him in order to understand their point of view- requirements- results,,,