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  4. A ButtonBar control automatically adds or removes children based on changes to the dataProvider property


    xmlns:s="library://ns.adobe.com/flex/spark"
    xmlns:mx="library://ns.adobe.com/flex/mx">
    
        
    
    
         
        // Add data item, and button, to the ButtonBar. 
        private function addFlexToDP():void { 
            myBB.dataProvider.addItem("Flex"); 
            addFlex.enabled=false; 
            removeFlex.enabled=true; 
        } 
        // Remove data item, and button, from the ButtonBar. 
        private function removeFlexToDP():void { 
            myBB.dataProvider.removeItemAt(4); 
            addFlex.enabled=true; 
            removeFlex.enabled=false; 
        } 
      
    
    
        
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            click="removeFlexToDP();" />