title: Remove focus rectangle on a UserControl
body: <p>I have a WPF UserControl with Focusable="True". It's the only focusable control in the window.</p>
  
  <p>Whenever the user presses Tab or Alt (and especially when they Alt+Tab to another application), my UserControl acquires a dotted-line border, aka focus rectangle. The focus rectangle then stays there until the window is closed.</p>
  
  <p>How can I prevent my UserControl from ever displaying this focus rectangle?</p>
  
  <h3>Edit</h3>
  
  <p>It turns out the focus rectangle wasn't actually being displayed by my UserControl. My Focusable UserControl contained another UserControl that, in turn, contained an ItemsControl, and the ItemsControl is what was showing the focus rectangle.</p>
  
  <p>When I added FocusVisualStyle="{x:Null}" to the ItemsControl, the focus rectangle went away.</p>