check this example code below to filter the dataGrid in flex actionscript 3.0, I hope it clarify how to use filter, if you still have problem ping me back :)

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical"	verticalAlign="middle"
				backgroundColor="white">
<mx:Script>
	<![CDATA[
		import mx.controls.dataGridClasses.DataGridColumn;
					
		private function processFilterFruit(item:Object):Boolean {
			return item.value == "Fruit";
		}
		private function processFilterVehicle(item:Object):Boolean {
			return item.value == "Vehicle";
		}
		protected function button1_clickHandler(event:MouseEvent):void
		{
			arrColl.filterFunction = processFilterFruit;
			arrColl.refresh();
		}
		protected function button2_clickHandler(event:MouseEvent):void
		{
			arrColl.filterFunction = processFilterVehicle;
			arrColl.refresh();
		}
		protected function button3_clickHandler(event:MouseEvent):void
		{
			arrColl.filterFunction = null;
			arrColl.refresh();
		}
	]]>
</mx:Script>

<mx:ArrayCollection id="arrColl">
	<mx:source>
		<mx:Array>
			<mx:Object name="Apple" value="Fruit" />
			<mx:Object name="Guavava" value="Fruit" />
			<mx:Object name="Orange" value="Fruit" />
			<mx:Object name="Car" value="Vehicle" />
			<mx:Object name="Banana" value="Fruit" />
			<mx:Object name="Jeep" value="Vehicle" />
			<mx:Object name="Truck" value="Vehicle" />
		</mx:Array>
	</mx:source>
</mx:ArrayCollection>

<mx:Panel status="{arrColl.length}/{arrColl.source.length} item(s)">
	<mx:DataGrid id="dataGrid" dataProvider="{arrColl}" verticalScrollPolicy="on">
		<mx:columns>
			<mx:DataGridColumn dataField="name" />
			<mx:DataGridColumn dataField="value"  />
		</mx:columns>
	</mx:DataGrid>
	<mx:ControlBar>
		<mx:Button label="Filter by Fruit" click="button1_clickHandler(event)"/>
		<mx:Button label="Filter by Vehicle" click="button2_clickHandler(event)"/>
		<mx:Button label="No filter" click="button3_clickHandler(event)"/>
	</mx:ControlBar>
</mx:Panel>
</mx:Application>

Hi,
Yes u have sent the code long before.. i tried that also..
but now what problem im facing is,
once i click first combobox it ll get filtered in forst column of grid.. after that if i click second combobox it should filter the data in already filterer datagrid contents...(in second column filter)
But that is not hapeening.. second column grid get filtered in default grid value only..but i dont want that..
Can u please suggest solution for this?

you can filter by any column , I have filtered the using "value" column , you can also filter by "name" column using code:

return item.name == "Apple";

Hi,

see if its my first state of grid.In this simple example it may feel odd..but whatever im developing such case will come..

Apple Fruit
Guavava Fruit
Orange Fruit
Orange Fruit
Apple Fruit
Apple Vehicle


when i click on filter by fruit i ll get o/p like


Apple Fruit
Guavava Fruit
Orange Fruit
Orange Fruit
Apple Fruit

which is proper..


now when i ckick on search by apple ( used like this return item.name == "Apple"; )

im getting o/p like,
Apple Fruit
Apple Fruit
Apple Vehicle



but it should not happen..it should only give

Apple Fruit
Apple Fruit

because i have already filtered based on fruits, now i wanna filter another column in this filtered items itself..

Can u please give solution for this..im struck in this from 1 week:( im facing problem in achiving this..