title: How to format column to show percent (%) in the xtragrid
body: <p>I have a xtragrid with values from a stored procedure.<br>
  I am getting the values in float (0.23) and I want to display in percent (23%).<br>
  What would be the best way to do it in C#?  </p>
  
  <p>before
  <img src="https://i.stack.imgur.com/B1Sh8.png" alt="before">
  after
  <img src="https://i.stack.imgur.com/ZaQbj.png" alt="after"></p>