Trying to show/unshow a object

Hello
i want to make a game, with a Win Screen. I imported a File and this works, but in the Screen the UI is allready displayed. So i have a question. Is there any way to show/unshow a UI object or to show/unshow a Group?
Could someone help me?

~Slimekong

You can modify the visibility property of any core object to make it visibile/invisibile.
Core Object Documentation