GUI Flickers on click event

[jestermax]

Hey, i have some gui controls that i set to not be visible. The problem is: for some reason when i test for click and gui click events on other objects, the invisible objects flicker. Has this happened to anyone before? I'm using Jirr which uses Irrlicht 1.1 so i'm wondering if it's just that but i thought i'd ask just in case some one has already gone through this.