minimize() then application exit

Hello,

May be my issue based on my misunderstanding... but please help me.

I made window minimize process like these.

app.addEventListener(Event.USER_IDLE, function(e:Event):void{

  var window:NativeWindow = nativeWindow;

  window.minimize();

});

It is run well on debugger, minimize to Taskbar and Dock.

However, after export release package, it is run not well, minimize and exit soon.

Why run well on debugger, exit suddenly on release package?

Please help me.

Thank you very much