[xmonad] Hopefully Very Simple Question

Greetings: I am very happy with my xmonad now. Fixed it with your help and the help of the DT (YouTube) community though this community was able to help me the most. THANK-YOU! My new issue is annoying to me and not something that keeps the system from working. I am using isDialog to spawn dialog boxes as floating windows. They spawn floating but show up to the right top of the screen. I would like them always be centered. Is this possible and if so how do I modify the layout statement? Thanks, Regards, Michael Needham