Use the Reset button to restore the collection view to its original state.

           
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<!-- dpcontrols\SortFilterArrayCollection.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:s="library://ns.adobe.com/flex/spark"
    xmlns:mx="library://ns.adobe.com/flex/mx" width="600">
    <s:layout>
        <s:VerticalLayout />
    </s:layout>
    <fx:Script>
         
        import mx.collections.*; 
        /* Function to sort the ICollectionView 
        in ascending order. */ 
        public function sortAC():void { 
            var sortA:Sort = new Sort(); 
            sortA.fields=[new SortField("label")]; 
            myAC.sort=sortA; 
            //Refresh the collection view to show the sort. 
            myAC.refresh(); 
        } 
        /* Function to filter out all items with labels 
        that are not in the range of M-N. */ 
        public function stateFilterFunc(item:Object):Boolean { 
            return item.label >= "M" && item.label < "O"; 
        } 
        /* Function to apply the filter function the ICollectionView. */ 
        public function filterAC():void { 
            myAC.filterFunction=stateFilterFunc; 
            /* Refresh the collection view to apply the filter. */ 
            myAC.refresh(); 
        } 
        /* Function to Reset the view to its original state. */ 
        public function resetAC():void { 
            myAC.filterFunction=null; 
            myAC.sort=null; 
            //Refresh the collection view. 
            myAC.refresh(); 
        } 
      
    </fx:Script>
    <fx:Declarations>
        <!-- An ArrayCollection with an array of objects. -->
        <mx:ArrayCollection id="myAC">
            <fx:Array id="myArray">
                <fx:Object label="LA" data="Baton Rouge" />
                <fx:Object label="NH" data="Concord" />
                <fx:Object label="TX" data="Austin" />
                <fx:Object label="MA" data="Boston" />
                <fx:Object label="AZ" data="Phoenix" />
                <fx:Object label="OR" data="Salem" />
                <fx:Object label="FL" data="Tallahassee" />
                <fx:Object label="MN" data="Saint Paul" />
                <fx:Object label="NY" data="Albany" />
            </fx:Array>
        </mx:ArrayCollection>
    </fx:Declarations>
    <!-- Buttons to filter, sort, or reset the view in the second ComboBox 
        control. -->
    <s:HGroup width="100%">
        <s:Button id="sortButton" label="Sort" click="sortAC();" />
        <s:Button id="filterButton" label="Filter" click="filterAC();" />
        <s:Button id="resetButton" label="Reset" click="resetAC();" />
    </s:HGroup>
    <s:ComboBox id="cb1" dataProvider="{myAC}" />
</s:Application>

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Use the Reset button to restore the collection view to its original state. : State « Effects « Flex

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