title: Extjs checkbox column: make difference between click on checkbox and the rest of the field
body: <p>i have a grid with a checkboxcolumn, all works fine but i would like to take different action between clicking on the checkbox itself and clicking besides it in the same field.
   Is this feasable in ExtJs ? I work with version 3.3.1 but i guesss that an example from another version would get me started.</p>
  
  <pre><code>var checkColumn = new Ext.grid.CheckColumn({
      header: 'Checklist OK ?',
      dataIndex: 'checklist_ok',
      width: 20,
      align: 'center'
  });
  
  cmDiverse = new Ext.grid.ColumnModel({
      defaults: {
          "sortable": true,
          "menuDisabled": false,
          "align": "right"
      },
      store: storeDiverse,
      columns: [{
          "id": "id",
          "header": "id",
          "hidden": true,
          "dataIndex": "id",
          "width": 20
      },
  </code></pre>
  
  <p>checkColumn, ...</p>
  
  <pre><code>gridDiverse = new Ext.ux.grid.livegrid.EditorGridPanel({
      id: "gridDiverse",
      enableDragDrop: false,
      loadMask: true,
      clicksToEdit: 1,
      layout: 'anchor',
      cm: cmDiverse,
      ....
  </code></pre>