title: How do I add checkbox column to ExtJS 5 grid?
body: <p>I want to have a checkbox (true/false) for my extjs grid.
  When I try to add item of xtype : 'checkbox' I get an error :</p>
  
  <blockquote>
    <p>Uncaught TypeError: column.isColumnHidden is not a function</p>
  </blockquote>
  
  <p>I've seen on a a post that there is a plugin of checkbox column that needs to be downloaded and included in ExtJS , Isn't there a built in option in ExtJS 5 for checkbox in a grid ?</p>