How do I activate and deactivate the Control Lock feature?

To turn on Control Lock, press and hold the Control Lock keypad for 3 seconds; the Control Lock light will stay on briefly, indicating all keypads are disabled. If any keypad is pressed while the dishwasher is locked, the light will flash 3 times. To turn off Control Lock, press and hold Control Lock for 3 seconds until the light turns off. Note that the dishwasher door can still be opened and closed while the controls are locked. (Page 9)