title: customize combo box arrow in WPF
body: <p>I want to customize the WPF Combo Box arrow postion like this <img src="https://i.stack.imgur.com/7tmyR.png" alt=""></p>
  
  <p>I google it. But i could not get any correct answer.</p>
  
  <p>How can i customize the combo box arrow?</p>