[flexcoders] Matt Chotin please help -- keeping scroll position in a datagrid to the last position after updating dataprovider with new data

[Chaitu Vadlapatla]

my scroll stays at the previous position on refreshing data or 
bring in new data to the dataprovider but throws an error when i try to 
scroll to the top and also has lots of blank rows of data. is this some sort of 
bug? 
 
public var listScrollPosition:Number = 
0;
 
public function 
rememberDGPosition(){   listScrollPosition = 
devicesListViewGrid.verticalScrollPosition;   }  
 public function loaded(){ 
       gateway.call( 
"DBDeviceManager.getPage5", new Responder(onResult, 
onFault),userid);   }
   public function 
onResult(result:Array):void{       abcd = 
result;
      devicesListViewGrid.verticalScrollPosition = 
listScrollPosition ;       
intervalIdList = setInterval(loaded, 
durationList);   }
++++++++++++++++++++++++++++
<mx:DataGrid x="10" y="3" verticalGridLines="false" 
useRollOver="false" id="devicesListViewGrid" 
dataProvider="{abcd}" width="704" height="392" mouseDownEffect="none" 
selectionColor="#CDF3DD" rollOverColor="#013826" 
alternatingItemColors="[#FFFFFF,#E1F5E8]" 
headerColors="[#006E4F,#006E4F]" borderStyle="solid" 
horizontalGridLineColor="#BAE2CA" verticalGridLineColor="#BAE2CA" 
horizontalGridLines="true"  borderColor="#BAE2CA" color="#FFFFFF" 
sortableColumns="false" 
render="rememberDGPosition()" >      <mx:columns>     <mx:DataGridColumn 
width="50" id="datagridcolumn" headerText=" "  
itemRenderer="CheckCellRenderer"/>     <mx:DataGridColumn 
headerText="NAME" dataField="name" 
itemRenderer="CheckBoxRenderer"/>           <mx:DataGridColumn 
width="140" headerText="CURRENT STATUS" dataField="pmid" 
itemRenderer="chartPivot"/>          <mx:DataGridColumn 
editable="false" width="90"  headerText="DURATION" 
dataField="duration" 
itemRenderer="DurationRenderer"/>      <mx:DataGridColumn 
editable="false" width="110" headerText="LAST CHANGE" 
dataField="lastchange" 
itemRenderer="lasChangeRenderer"/>      <mx:DataGridColumn  
editable="false" width="100" headerText="PREVIOUS STATUS" 
dataField="previousstatus" 
itemRenderer="previousStateRenderer"/>      <mx:DataGridColumn 
editable="false" headerText="GROUP" dataField="group" 
itemRenderer="groupRenderer"/>                 </mx:columns>    </mx:DataGrid>
 
Thanks,
Chaitu.
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