title: How to link a pdf download in JsonStore for Extjs 3.4
body: <p>I would like to have the pdf item (f_release_note) be a link to open the pdf.<br />
  f_release_note - is stored in the database as blob.</p>
  <pre><code>Medit.Admin.ReleaseNotes.Stores.ReleaseNotes = new Ext.data.JsonStore({
      storeId: 'ReleaseNotes',
      url: 'fc.php?_C_A=ReleaseNotes.getList',
      root: 'root',
      remoteSort: true,
      autoLoad: true,
      successProperty: 'succcess',
      baseParams: {
          start: 0,
          limit: 25
      },
      idProperty: 'f_uid',
      fields: [{
          name: 'f_uid',
          type: 'int'
      
      }, {
          name: 'f_release',
          type: 'date',
          dateFormat: 'm/d/Y'
      
      },{
          name:'f_version_number',
          type: 'string'
      },{
         name:'f_release_note',
         type:'string'
      }]
  });
  </code></pre>
  <p>Screen display
  Release Notes</p>
  <p>Release     Version Number      Release Note
  2/09/2021   25.01.01            Release 21.01 pdf</p>
  <p>I would like to have the ability for the user to click Release 21.01 pdf and open the pdf file.</p>