title: Extjs how to capture when the checkbox is checked or unchecked in xtype: 'checkcolumn'
body: <p>I am new to EXTJS. I have a grid , where I have checkbox column . What I wanted is , how to capture the  check or uncheck events  happening in the  checkbox .</p>
  
  <p>Here is my code for checkbox in my grid </p>
  
  <pre><code>    columns : [
  
               {
              xtype: 'checkcolumn',
                     header: 'Enabled',
                dataIndex: 'isEnabled',
                width: 55
             },
          ....
           ]
  </code></pre>
  
  <p>Please help </p>