You can use check boxes to make it possible for a user to specify a Boolean state: True or False, On or Off, Open or Closed. However, there are times when it is not accurate to evaluate something as True or False, such as unanswered questions on a True/False questionnaire.
To see examples of using check boxes
Run Solution.app in the Visual FoxPro ...\Samples\Solution directory.
In the tree view, click Controls, and then click Check boxes.