title: jqWidget CheckBox in grid capture checkbox change
body: <p>I have a jqxGrid which I have a few checkboxes in.
  What I need to do is find an event which fires when the checkbox is changed.
  I have tried:<br/> </p>
  
  <ul>
  <li><code>changed</code></li>
  <li><code>cellbeginedit</code></li>
  <li><code>cellendedit</code></li>
  <li><code>cellvaluechanged</code></li>
  <li><code>cellvaluechanging</code></li>
  </ul>
  
  <p>.
  All to no avail.<br/><br/>
  I do not want to fire and event for when any cell is changed, just this one checkbox.
  <br/><br/>Any ideas on how this might be accomplished?
  <br />I have included the code below.
  <br/>The checkbox is the 'Re-Cert' line</p>
  
  <pre><code>$("#ModulesGrid").jqxGrid({
          width: 890,
          height: 350,
          theme: modulesTheme,
          columnsresize: true,
          source: dataAdapter,
          pageable: true,
          editable: true,
          columns: [
                    { text: 'Module Name', datafield: 'modulename', width: 100, editable: false },
                    { text: 'Optional', datafield: 'Optional', columntype: 'checkbox', width: 100 },
                    { text: 'Assigned', datafield: 'Assigned', width: 80 , columntype: 'checkbox'},
                    { text: 'Pass', datafield: 'pass',cellsrenderer: radioRenderer,width: 50, editable: false },
                    { text: 'NC', datafield: 'nc',cellsrenderer: radioRenderer,width: 50, editable: false },
                    { text: 'Fail', datafield: 'fail',cellsrenderer: radioRenderer,width: 50, editable: false },
                    { text: 'Re-Cert', datafield: 'recert', columntype: 'checkbox', width: 50, cellvaluechanged: function(event){alert(1);}},
                    { text: 'Re-Cert Reason', datafield: 'reason', width: 100, editable: false},
                    { text: 'Prior Cert', datafield: 'priorcert', width: 50, editable: false }
                ]
      });
  </code></pre>
  
  <p>here is a link to the API: <a href="http://www.jqwidgets.com/jquery-widgets-documentation/documentation/jqxgrid/jquery-grid-api.htm" rel="nofollow">http://www.jqwidgets.com/jquery-widgets-documentation/documentation/jqxgrid/jquery-grid-api.htm</a></p>
  
  <p>Edit: It would not let me tag this under jqWidget as that tag does not exist and I do not have 1500 rep. Sorry is this confuses.</p>