I haven't been posting for a while, it is not that I'm lazy ;) We've been working on something exiting that will be release in a while, be patient.
I've solved some bugs in BaseUI, one about the width of a DisplayObject which wasn't updated well when the content changed.
I've also added a keepOnScreen property set by default to true in BaseUI and ElementUI. It won't be a final solution as I'm going to build layouts when I'll have time, they will handle this behavior in a better way. At the moment, with this property set to true, the top-left corner of a DisplayObject won't go off screen.
See the demo.