Add Filter to Data Grid Adobe Flex

<?xml version="1.0" encoding="utf-8"?>
<mx:Application creationComplete="login(event)" xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" xmlns:salesforce="http://www.salesforce.com/">
	<salesforce:Connection id="apex" serverUrl="https://www.salesforce.com/services/Soap/u/9.0" />
	
<mx:Script>
	<![CDATA[
			import mx.collections.ArrayCollection;
			import com.salesforce.results.QueryResult;
			import mx.utils.ObjectUtil;
			import mx.controls.Alert;
			import com.salesforce.AsyncResponder;
			import com.salesforce.objects.LoginRequest;
			
			private function login(event:Event):void {
				var lr:LoginRequest = new LoginRequest();
				lr.server_url = parameters.server_url;
				lr.session_id = parameters.session_id;
				lr.callback = new AsyncResponder(loadData, handleFault);
				apex.login(lr);
			}
 
			[Bindable]
			private var accountList:ArrayCollection = new ArrayCollection();
			
			
			private function handleFault(fault:Object):void {
				Alert.show(ObjectUtil.toString(fault));
			}
			
			private function loadData(lr:Object):void {
				apex.query("Select Name, Phone, Type From Account", new AsyncResponder(
					function(qr:QueryResult):void {
						if (qr.size > 0) {
							accountList = qr.records;
						}
					}, 
					handleFault)
				);
			}
		
	]]>
</mx:Script>	
	<mx:DataGrid dataProvider="{accountList}" left="10" right="10" top="10" bottom="10">
		<mx:columns>
			<mx:DataGridColumn dataField="Name"/>
			<mx:DataGridColumn dataField="Phone"/>
			<mx:DataGridColumn dataField="Type"/>
		</mx:columns>
	</mx:DataGrid>
	
</mx:Application>