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FLEX: Keeping selection in a DataGrid when the data changes
<fx:Declarations>
    <s:HTTPService id="myDataProvider" url="http://www.mysite.xxx/load.xml" useProxy="false" method="POST"></s:HTTPService>
</fx:Declarations>

<fx:Script>
    <![CDATA[
        import mx.rpc.events.ResultEvent;

        protected function init():void
        {
            myDataProvider.send();
        }

        protected function doSend():void
        {

            var myidx:int = new int(dgLobby.selectedIndex);
            var myVertPos:int = new int(dgLobby.verticalScrollPosition);


            myDataProvider.send();


            dgLobby.selectedIndex = myidx;
            dgLobby.verticalScrollPosition = myVertPos;

        }

    ]]>
</fx:Script>
<mx:DataGrid id="dgLobby" x="3" top="1" bottom="72" width="710" borderColor="#C2C2C2"
            borderVisible="true" chromeColor="#BFBCBC" fontSize="11" fontWeight="normal"
            dataProvider="{myDataProvider.lastResult.users.user}">
    <mx:columns>
            <mx:DataGridColumn width="100" dataField="name" headerText="Name" resizable="true" sortable="true"></mx:DataGridColumn>
            <mx:DataGridColumn width="100" dataField="email" headerText="Email" resizable="true" sortable="true"></mx:DataGridColumn>
            <mx:DataGridColumn width="100" dataField="status" headerText="Status" resizable="true" sortable="true"></mx:DataGridColumn>
    </mx:columns>
</mx:DataGrid>


<s:Button x="793" y="126" label="Refresh" click="doSend()"/>