title: How to configure custom validation rules for kendo grid editor
body: <p>We have ASP.NET MVC application using Telerik UI for ASP.NET MVC. On the page is set up a grid with popup editor, by kendo html helper.</p>
  
  <p>Now I need to configure some custom validation rules for popup editor form. I can't find a way how to do it. </p>
  
  <ul>
  <li>In validator documentation can be seen to get validator reference from <code>$("form")</code>. But there is no form in grid popup</li>
  <li>If I configure rules on validator taken from <code>$("gridName").kendoValidator().data("kendoValidator")</code>, such rules are simply not fired when saving editor changes</li>
  <li>If I get reference to validator from some editor container <code>gridOnEditEvent.container.find("#editorcontent").kendoValidator().data("kendoValidator")</code>, for example, I can extend rules, validate and send form data manually, but standard save button of the popup editor doesn't reflect such configuration</li>
  </ul>
  
  <p>How can extend validation rules of the grid popup editor validator?</p>