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Set selected index for DataGrid

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">     <mx:Script>                      import mx.collections.ArrayCollection;             import mx.events.CuePointEvent;             import mx.events.VideoEvent;             [Bindable]             private var arrColl:ArrayCollection = new ArrayCollection()             private function doVideoEvent(evt:VideoEvent):void {                 doAddItem({type:evt.type});             }             private function doCuePointEvent(evt:CuePointEvent):void {                 doAddItem({type:evt.type});             }             private function doProgressEvent(evt:ProgressEvent):void {                 doAddItem({type:evt.type});             }             private function doAddItem(obj:Object):void {                 arrColl.addItem({type:obj.type, state:videoDisplay.state, playheadTime:videoDisplay.playheadTime, totalTime:videoDisplay.totalTime});                 dataGrid.validateNow();                 dataGrid.selectedIndex = arrColl.length;                 dataGrid.scrollToIndex(arrColl.length);             }            </mx:Script>     <mx:VideoDisplay id="videoDisplay" source="http://server.com/a.flv"              autoPlay="false"              autoRewind="false"             ready="doVideoEvent(event);"             rewind="doVideoEvent(event);"             playheadUpdate="doVideoEvent(event);"             close="doVideoEvent(event);"             complete="doVideoEvent(event);"             progress="doProgressEvent(event);" />     <mx:HBox>         <mx:Button label="play()" click="videoDisplay.play();" />         <mx:Button label="pause()" click="videoDisplay.pause();" />         <mx:Button label="stop()" click="videoDisplay.stop();" />     </mx:HBox>     <mx:DataGrid id="dataGrid" dataProvider="{arrColl}" width="320" rowCount="5">         <mx:columns>             <mx:DataGridColumn id="typeCol"         dataField="type" headerText="Evt. type" />             <mx:DataGridColumn id="stateCol"        dataField="state" />             <mx:DataGridColumn id="playheadTimeCol" dataField="playheadTime" textAlign="right" />             <mx:DataGridColumn id="totalTimeCol"    dataField="totalTime" textAlign="right" />         </mx:columns>     </mx:DataGrid> </mx:Application>