Count item count for ComboBox selected item

       
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Script>
        
        import mx.collections.*;
        
        private var myCursor:IViewCursor;

        public function countLast(theCursor:IViewCursor):int {
            var counter:int=0;
            var mark:CursorBookmark = theCursor.bookmark;
            while (theCursor.moveNext()) {
                counter++;
            }
            theCursor.seek(mark);
            return counter;
        }
        public function countFromSelection():void {
            myCursor.findFirst(myCB.selectedItem);
            var count:int = countLast(myCursor);
            ta1.text += myCursor.current.label + " at " + count;
        }
      
    </mx:Script>
    <mx:ArrayCollection id="myAC">
        <mx:Object label="A" data="AA" />
        <mx:Object label="B" data="BB" />
        <mx:Object label="C" data="CC" />
    </mx:ArrayCollection>
    <mx:ComboBox id="myCB" rowCount="7" dataProvider="{myAC}" change="countFromSelection();" />
    <mx:TextArea id="ta1" height="200" width="175" />
</mx:Application>

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Count item count for ComboBox selected item : ComboBox Selection « Components « Flex

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