NativeApplication.nativeApplication.addEventListener(Event.DEACTIVATE, onDeactive);
private function onDeactive(event : Event) : void
{
NativeApplication.nativeApplication.exit();
}
アプリケーション記述ファイルのInfoAdditionsタグにUIApplicationExitsOnSuspendを追加
xxxx-app.xml
<iPhone>
<InfoAdditions>
<![CDATA[
//・・・略・・・
<key>UIApplicationExitsOnSuspend</key><true />
//・・・略・・・
]]></InfoAdditions>
</iPhone>