dropdownlist.mxml
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Script>
<![CDATA[
import flash.events.MouseEvent;
public function show(event:MouseEvent):void{
myText.text = String(myComboBox.value);
}
]]>
</mx:Script>
<mx:Panel title="ComboBox" width="402" height="188" x="90.5" y="79" layout="absolute">
<mx:ComboBox id="myComboBox" width="171" x="10" y="10">
<mx:dataProvider>
<mx:Array>
<mx:Object label="ComboBox1" data="1" />
<mx:Object label="ComboBox2" data="2" />
<mx:Object label="ComboBox3" data="3" />
</mx:Array>
</mx:dataProvider>
</mx:ComboBox>
<mx:Button id="myButton" label="Send" x="200" y="10" click="show(event);"/>
<mx:Label id="myText" maxWidth="20" width="244" height="23" y="60" x="10" />
</mx:Panel>
</mx:Application>
