[Qt-interest] Layout for overlaying widget on top of another

[velociraptor Genjix]

Hey, I have a QMdiArea and want to add a sidebar. When I add my sidebar to a horizontal layout, it shifts the view to the right (diagram below)        http://img705.imageshack.us/img705/5027/sidewaysr.jpg       I want the QMdiArea widget to stay the same size, and just add the toolbox on top.       http://img183.imageshack.us/img183/2958/overlayed.jpg       How can I achieve this? Which layout can I use?    Thanks!