script


      <mx:Script>
          <![CDATA[
              import flash.events.MouseEvent;
          
              private function clickHandler ( event:MouseEvent ):void
              {
                  myLabel.text = "hello world";
              }
          ]]>
      </mx:Script>

panel


      
      <mx:Panel 
          title="hello world" horizontalAlign="center"
          paddingTop="10" paddingBottom="10" paddingLeft="10" paddingRight="10" 
      >
          <mx:Label id="myLabel" width="180" fontWeight="bold" fontSize="24"/>
          <mx:Button id="myButton" label="click me!" click="clickHandler(event);" />
      </mx:Panel>
  </mx:Application>