title: How to get item value when editItem function is called in jsGrid
body: <p>in my jsGrid config, I have called <code>editItem</code> function like this:</p>
  
  <pre><code>            editItem: function(item) {
                  var $row = this.rowByItem(item);
                  if ($row.length) {
                      console.log('$row: '+JSON.stringify($row));
                      this._editRow($row);
                  }
              },
  </code></pre>
  
  <p>at <code>console.log</code>, I get result : </p>
  
  <pre><code>{
    "0": {
      "jQuery223061031009408811742": {
        "JSGridItem": {
          "myColumn1": "AB",
          "myColumn2": "BC",
          "myColumn3": "CD",
        }
      },
      "jQuery223061031009408811741": {
        "events": {
          "click": [
            {
              "type": "click",
              "origType": "click",
              "guid": 67,
              "namespace": ""
            }
          ],
          "dblclick": [
            {
              "type": "dblclick",
              "origType": "dblclick",
              "guid": 68,
              "namespace": ""
            }
          ],
          "mouseover": [
            {
              "type": "mouseover",
              "origType": "mouseenter",
              "data": null,
              "guid": 69,
              "namespace": ""
            }
          ],
          "mouseout": [
            {
              "type": "mouseout",
              "origType": "mouseleave",
              "data": null,
              "guid": 70,
              "namespace": ""
            }
          ]
        }
      }
    },
    "selector": "",
    "context": {},
    "length": 1
  }
  </code></pre>
  
  <p>My real fields are inside <code>jQuery223061031009408811742 -&gt; JSGridItem</code></p>
  
  <p>How can I get those values with function in jsGrid ? or maybe there is builtin function in JSON to solve that?</p>
  
  <p>Note: field <code>jQuery223061031009408811742</code> always changed every time page reload, so I can't hardcode the field name to call it.</p>