use removeChild() method to remove a control from a container

          
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Script>
        
        public function removeButton():void {
            myHBox.removeChild(myButton);
        }
      
    </mx:Script>
    <mx:HBox id="myHBox">
        <mx:Button id="myButton" label="Remove Me"
            click="removeButton();" />
    </mx:HBox>
</mx:Application>

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use removeChild() method to remove a control from a container : HBox « Container « Flex

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