Thanks Thomas, I will try that. If I can change layout then I can have a workaround to changing region by changing the layout to one of the few layouts I need. Once I have this ability I can use region renderer and other renderers adequately. I will go back to this whenever I have time to redesign my app. For example, if EDIT mode is used to configure and customize the VIEW mode, in most cases the layout is different. Layout is really key. Let me try to explain how jbp misses it. First you can see a grid as a vertical division. Each column have lines and each line in a column can embed a grid as well. Each can be resizeable and with a very simple scheme, column could be resizeable horizontally (changing their width), line vertically (changing their height). In addition of resizing there is also collapse effect with a variant providing vertical accordion or horizontal accordion. YUI is perfect with grid and resize for layout/region/window, their beta implementation of layout is strange and does not fit well (not the concept just the implementation) Hope this helps, I 'll revisit my design in a few months. You seem to develop faster than I do anyway. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4131991#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...