title: Add checkboxes in a jqGrid on the basis of value retrieved through the json
body: <p>I have a json which returns some strings as "true" or "false"
  Now, on the basis of the above values, the checkbox state should behave.</p>
  
  <p>For exmaple:
  If true is retrieved for that column, the checkbox state should be on.
  If false is retrieved for that column, the checkbox state should be off.</p>
  
  <p>Can we do this manipulation in jQuery-jqGrid? Can someone help me with some sample code?</p>