title: WPF - Prevent ListView from losing focus
body: <p>I would like the selected item(s) in my ListView to remain focused when the user interacts with the Calendar control.</p>
  
  <p>Currently when the user clicks an item in the list it becomes highlighted.
  <img src="https://i.stack.imgur.com/cMXZE.png" alt="List View focused"></p>
  
  <p>When they click the calendar focus is lost, which I don't want.
  <img src="https://i.stack.imgur.com/TVqtD.png" alt="List View Lost Focus"></p>
  
  <p>How do I prevent my Calendar from stealing focus from the ListView?
  or
  How do I prevent my ListView from giving up focus?</p>