title: Is there an easy way to add a checkbox to a balloon tip?
body: <p>Is there an easy way to add a checkbox (or any other custom control, for that matter) inside a balloon tip?</p>
  
  <p>I want to provide the user with an optional checkbox that reads "Never show this message again".</p>
  
  <p>The balloon tip in question is shown using <code>NotifyIcon.ShowBalloonTip()</code>.</p>