title: Selected item loses style when focus moved out in WPF ListBox
body: <p><strong>What do I have?</strong></p>
  
  <p>I have a <code>ListBox</code> populated with items from an XML file. Given a <code>DynamicResource</code> for <code>Style</code> property and written trigger for <code>IsSelected</code> in <code>ItemContainerStyle</code>.    </p>
  
  <p><strong>What do I want to do?</strong></p>
  
  <p>I want to keep the selected Item highlighted even after focus moved out of the <code>ListBox</code>.</p>
  
  <p><strong>What problem am I facing?</strong></p>
  
  <p>When I select an item the style specified in <code>IsSelected</code> trigger works. But, when I move the focus out of list box (press tab or click on some other control) the selected item loses its style. Is there any way so that I can retain the selected item style?</p>
  
  <p>Thanks in advance!</p>