flex datagrid combox

http://stackoverflow.com/questions/1408729/flex-datagrid-with-combobox-itemrenderer

<?xml version="1.0" encoding="utf-8"?><mx:ComboBox    xmlns:mx="http://www.adobe.com/2006/mxml"     dataChange="setSelected()"     change="onSelectionChange(event)"    focusEnabled="true">    <mx:Script>        <![CDATA[            import mx.events.DataGridEvent;            import mx.events.ListEvent;            import mx.controls.dataGridClasses.DataGridListData;            private var _ownerData:Object;            private var _lookupField:String = "value";            // When using this component as an itemEditor rather than an itemRenderer            // then set ' editorDataField="selectedItemKey"' on the column to             // ensure that changes to the ComboBox are propogated.            [Bindable] public var selectedItemKey:Object;            public function set lookupField (value:String) : void {                if(value) {                    _lookupField = value;                    setSelected();                }            }                       override public function set data (value:Object) : void {                if(value) {                                        _ownerData = value;                    setSelected();                }            }            override public function get data() : Object {                return _ownerData;            }                        private function setSelected() : void {                if (dataProvider && _ownerData) {                    var col:DataGridListData = DataGridListData(listData);                    for each (var dp:Object in dataProvider) {                        if (dp[_lookupField] == _ownerData[col.dataField]) {                            selectedItem = dp;                            selectedItemKey = _ownerData[col.dataField];                            return;                             }                    }                                    }                selectedItem = null;            }            private function onSelectionChange (e:ListEvent) : void {                if (selectedItem && _ownerData) {                                        var col:DataGridListData = DataGridListData(listData);                    _ownerData[col.dataField] = selectedItem[_lookupField];                    selectedItemKey = selectedItem[_lookupField];                }            }                           ]]>    </mx:Script>    </mx:ComboBox>//usage:<mx:DataGridColumn headerText="Child" dataField="PersonID" editable="false" textAlign="center">  <mx:itemRenderer>    <mx:Component>      <fx:GridComboBox dataProvider="{parentDocument.childrenData}" labelField="Name" lookupField="PersonID" change="dispatchEvent(new mx.events.DataGridEvent(mx.events.DataGridEvent.ITEM_FOCUS_OUT, true, true))"/>    </mx:Component>  </mx:itemRenderer>                      </mx:DataGridColumn><mx:DataGridColumn labelFunction="lookupChildName" headerText="Child" dataField="PersonID" editable="true" editorDataField="selectedItemKey">    <mx:itemEditor>        <mx:Component>            <fx:GridComboBox dataProvider="{parentDocument.childrenData}" labelField="Name" lookupField="PersonID" change="dispatchEvent(new mx.events.DataGridEvent(mx.events.DataGridEvent.ITEM_FOCUS_OUT, true, true))"/>        </mx:Component>     </mx:itemEditor>      </mx:DataGridColumn>