title: WPF RowValidation column of DataGrid placement
body: <p>Is it possible to place <code>RowValidation</code> column not at the left side? For example, at the right side or somewhere else? </p>
  
  <p>How it looks:</p>
  
  <p><img src="https://i.stack.imgur.com/kfzs4.png" alt="enter image description here"></p>
  
  <p>How I want it to looks:</p>
  
  <p><img src="https://i.stack.imgur.com/qQn33.png" alt="enter image description here"></p>