help-data change in DataGrid when slection made in dropdown combobox as filters

[JJSAM]

I need some help. i'mgetting data in DG but it won't change when I
change the filters in combobox...


<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" x="0" y="0"
creationComplete="BL()">
<mx:Script>
<![CDATA[
import mx.controls.Alert;
import mx.collections.ArrayCollection;
import mx.rpc.events.ResultEvent;
import mx.controls.dataGridClasses.DataGridColumn;

[Bindable] private var test:ArrayCollection;

private function initBL():void {
Data.TST();
}
private function resultTST(event:ResultEvent):void{
test = ArrayCollection(event.result);
}
private function select_TST():void {
Alert.show(test.getItemAt(comboTST.selectedIndex).label);
}
]]>
</mx:Script>
<!--Database Server Connection -->
<mx:RemoteObject id="Data" destination="ColdFusion"
source="bin.files.BL" result="DG.dataProvider = event.result;">
<mx:method name="TST" result="resultTST(event)"/>
<mx:method name="getData" result="DG.dataProvider =
event.result;"/>
</mx:RemoteObject>
<mx:ComboBox x="10" width="110" id="comboTST" dataProvider="{test}"
change="select_TST()"></mx:ComboBox>
<mx:DataGrid id="DG" top="90" creationComplete="Data.getData();">
<mx:columns>
<mx:DataGridColumn headerText="CFS" dataField="CFSs"/>
<mx:DataGridColumn headerText="TOOL" dataField="TOOLs"/>
</mx:columns>
</mx:DataGrid>

</mx:Canvas>

Any help is appreciated...