title: Input non english characters into WPF Combobox
body: <p>I am using .net framework 4.5</p>
  
  <p>I have a WPF project, and I use WPF combobox. The property <code>IsEditable</code> is set to <code>true</code> to allow input values.</p>
  
  <p>But when I input non English character such as "â" (I have to type <strong>"aa"</strong> to make <strong>"â"</strong>, it becomes <strong>"aâ"</strong>.</p>
  
  <p>When I set property <code>IsTextSearchEnabled = "False"</code>, <strong>"aa"</strong> becomes <strong>"â"</strong> (This is correct behavior).</p>
  
  <p>Does anyone have solution for this when set  <code>IsTextSearchEnabled = "True"</code> for WPF combo box?</p>