title: Select ComboBox First item in DataGridComboBoxColumn
body: <p>I want the first item of each combo box to be selected automatically.</p>
  <pre><code>&lt;DataGridComboBoxColumn SelectedItemBinding=&quot;{Binding Version}&quot; &gt;
      &lt;DataGridComboBoxColumn.EditingElementStyle&gt;
          &lt;Style TargetType=&quot;ComboBox&quot;&gt;
              &lt;Setter Property=&quot;ItemsSource&quot; Value=&quot;{Binding Path=Versions}&quot; /&gt;
          &lt;/Style&gt;
      &lt;/DataGridComboBoxColumn.EditingElementStyle&gt;
  
      &lt;DataGridComboBoxColumn.ElementStyle&gt;
          &lt;Style TargetType=&quot;ComboBox&quot;&gt;
              &lt;Setter Property=&quot;ItemsSource&quot; Value=&quot;{Binding Path=Versions}&quot; /&gt;
          &lt;/Style&gt;
      &lt;/DataGridComboBoxColumn.ElementStyle&gt;
  
  &lt;/DataGridComboBoxColumn&gt;
  </code></pre>
  <p>I wrote <code>&lt;Setter Property=&quot;SelectedIndex&quot; Value=&quot;0&quot; /&gt;</code> on <strong>EditingElementStyle</strong> &amp; <strong>ElementStyle</strong> but nothing happened and it doesn't work.</p>