title: How to trigger the Selected event when I select one item everytime
body: <p>I have a <code>TreeView</code> like this:</p>
  
  <p>xaml:</p>
  
  <pre><code>&lt;TreeView&gt;
       &lt;TreeViewItem Header="header" Name="mytreeViewItem" Selected="mytreeViewItem_Selected"/&gt;
  &lt;/TreeView&gt;
  </code></pre>
  
  <p>xaml.cs:</p>
  
  <pre><code>mytreeViewItem.ItemsSource = new List&lt;string&gt;(){"a"};
  </code></pre>
  
  <p>When I select the <code>TreeViewItem</code> nameed <code>a</code>, it will trigger event <code>mytreeViewItem_Selected</code>. But when I select the <code>TreeViewItem</code> again, it wont trigger the event again. How can I trigger the <code>Selected</code> event when I select the <code>TreeView</code> every time?</p>