title: extjs - Roweditor not working
body: <p>I have a gridPanel defined as follows:</p>
  
  <pre><code>Ext.define('Mb.view.winbiz.ExportGrid', {
      extend: 'Ext.grid.Panel',
      store: 'winbiz.Exports',
      plugins: [{ptype: 'rowediting', clicksToMoveEditor: 2, autoCancel: false}],
      columns: [
          {text: 'Id',  dataIndex: 'id'},
          {
              text: 'Description', 
              dataIndex: 'description', 
              flex:1,
              editor: {
                  xtype: 'textfield',
                  allowBlank: false
              }
          }
      ]
  });
  </code></pre>
  
  <p>I have this problem with the rowEditing plugin:<br>
  Instead of editing the line on which I double-click, a new row is inserted at the top of the grid, but it does not show the editor fields.</p>
  
  <p>I looked everywhere in the code and compared to a <a href="http://docs.sencha.com/extjs/4.2.2/#!/guide/direct_grid_pt2" rel="nofollow noreferrer">working example based on the doc</a>, but I cannot find what is not correct.</p>
  
  <p>This is how it looks like: <img src="https://i.stack.imgur.com/Oki4O.jpg" alt="enter image description here"></p>