title: Add calculated column with checkboxes to datagrid
body: <p>In my application I have a TcxGrid (devexpress datagrid) that displays the data returned from a stored procedure.<br>
  Now I would like to add a column showing checkboxes from which the values cannot come from the database but are calculated internally.
  When the checkboxes are clicked, some internal logic needs to be triggered.</p>
  
  <p>Any suggestions?</p>