title: extjs - CheckboxModel and RowExpander can't be used together?
body: <p>EXTJS Version: 4.07</p>
  
  <pre><code>Ext.create('Ext.grid.Panel', {
      selModel: Ext.create('Ext.selection.CheckboxModel'),
      plugins: [{
          ptype: 'rowexpander',
          rowBodyTpl : [ '&lt;p&gt;......&lt;/p&gt;' ]
      }],
      ...other config stuff...
  }
  </code></pre>
  
  <p>Running this code in the browser results in the following error at line 15 in ext-all.js.</p>
  
  <p>"Uncaught TypeError: Object [object Object] has no method 'getEditor'"</p>
  
  <p>Disabling either one of the two plugins stops the error. Any workaround/fix and/or further insight into this error would be greatly appreciated.</p>