title: TextBox LostFocus does not fire
body: <p>I have a problem with LostFocus event it does not fire when I click on the background.I read some stuff about focus logic and keyboard focus but I could not find a way to get the focus from a control a like textbox when there is only one of them</p>
  
  <p>XAML:</p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;Grid Height="500" Width="500"&gt;
      &lt;TextBox Height="23" Width="120" Margin="12,12,0,0" Name="textBox1" LostFocus="textBox1_LostFocus"  /&gt;
  &lt;/Grid&gt;
  </code></pre>
  
  <p>C#:</p>
  
  <pre><code>    private void textBox1_LostFocus(object sender, RoutedEventArgs e)
      {
  
      }
  </code></pre>