title: how to custom devexpress gridview popup
body: <p>My question may be a little bit weird because it makes me confused.
  Among all the documentations that I find on the devexpress site, none of them have examples based on ASP.NET MVC, but  just for ASP.NET Core or Winforms or the use of Devextreme and not devExpress.</p>
  <p>I have create with devexpress a gridview with Edit button that open popup.
  I want to customize the popup but don't know how and don't find an exemple.</p>
  <p>If someone can give me the way or exemple.</p>
  <p>Thanks you...</p>