Hi Laurent The GroupWindowMorph does fill the window, however it has no layout policy to the tab group within doesn't fill. In GroupWindowMorph initialize, either do a self changeProportionalLayout or self changeTableLayout (making the fullFrame: bit redundant). Regards, Gary ----- Original Message ----- From: laurent laffont To: An open mailing list to discuss any topics related to an open-sourceSmalltalk Sent: Wednesday, July 06, 2011 10:34 PM Subject: [Pharo-project] WindowOrganizer integration problems Hi, As work from Gary about grouping windows has been integrated in 1.4, I try to use it for TWM. If you load: Gofer it squeaksource: 'TilingWindowManager'; package: 'TWM'; load. StandardWindow new addMorph: GroupWindowMorph new fullFrame: (LayoutFrame fractions: (0@0 corner: 1@1)); openInWorld. You can drag and drop windows in the GroupWindowMorph to tab them. But I cannot find why GroupWindowMorph does not fill all the window....... Gary ? Then I want to use GroupWindowMorph in a DockingBar. There's some initial work in DockingWindowMorph but I'm stuck with the space fill problem. Cheers, Laurent Laffont - @lolgzs Pharo Smalltalk Screencasts: http://www.pharocasts.com/ Blog: http://magaloma.blogspot.com/ Developer group: http://cara74.seasidehosting.st