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  4. Setup data provider for PopUpMenuButton


    
        
        import mx.controls.Alert;
        public function showMsg(msg:String):void
        {
            Alert.show('You just clicked on ' + msg);
        }
      
    
            dataProvider="{['One','Two','Three']}" 
        click="showMsg('left side')"
        itemClick="showMsg('right side with ' + event.label)" />