I've been having a problem with the RadWindow displaying unwanted scrollbars for one of my user controls (the width for the window is set to Auto). I managed to solve the problem by just calling Measure() on the content UserControl before putting it inside the window. I guess this is not strictly a bug since I'm pretty sure it has something to do with the layout in my own user control. Nevertheless, it might be a good idea if RadWindow called Measure() internally before displaying the content, thus avoiding the scrollbars.