Flex mobile orientation: force portrait mode and then allow auto orientation

I'm creating a flex mobile project and I want to force the app to portrait orientation when I click a button, and when I click other button allow again to change the orientation.

This is my code when I click the first button, where I want to force portrait mode:

protected function click(event:MouseEvent😞void{ 
     if(stage.orientation != StageOrientation.DEFAULT){ 
          stage.addEventListener(StageOrientationEvent.ORIENTATION_CHANGE, orientationChanged); 
          stage.setOrientation(StageOrientation.DEFAULT); 
     }else{ 
          doSomething(); 
     }  
}   

private function orientationChanged(event:StageOrientationEvent😞void{ 
     doSomething(); 
     stage.removeEventListener(StageOrientationEvent.ORIENTATION_CHANGE, orientationChanged); 
}  

private function doSomething():void{ 
     stage.autoOrients = false; 
}

It works ok and it changes the orientation if it's needed.

Now, when I want to allow orientation change again, I've only putted:

stage.autoOrients = true;

It works ok if when I click the first button the app is in portrait and it doesn't have to change anything. But if it's on landscape and it have to change to portrait, when I allow orientation change again, it doesn't work ok.

Do you know if I have to allow or change something? Or, is there any better way to do this?

Thanks in advance