Redesign XamTreeGrid ColumnHeader
<p>I want to redesign the Infragistics XamTreeGrid column header like this picture.<br>
Thanks for your attention  </p>

<p><a href="https://i.stack.imgur.com/BrzHG.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/BrzHG.png" alt="enter image description here"></a></p>