Right now the only position option I see is center. It would be nice to have greater options for positioning the window in the viewport. I know that most people are fine with center but there are times when my business needs to display a lot of data. The center causes the window header to be center but then the user has to scroll or move the window to the top of the screen. Even just an option like TopCenter() would be enough for me. jQueryUI uses a position that takes strings.