title: How to cancel a routed event?
body: <p>I have a WPF application, where when a user unchecks a checkbox, the application will prompt to confirm.  If the user chooses not to continue (cancel) is selected, i want to cancel the uncheck event.  In another word, i want the checkbox to remain checked.</p>
  
  <p>How can i do that in WPF?</p>
  
  <p>Thanks in advance.</p>