[Pharo-project] Group windows as tab screencast

Here's a screencast: http://magaloma.blogspot.com/2011/07/twm-docking-windows.html Test and feedback welcome. Laurent Laffont - @lolgzs <http://twitter.com/#!/lolgzs> Pharo Smalltalk Screencasts: http://www.pharocasts.com/ Blog: http://magaloma.blogspot.com/ Developer group: http://cara74.seasidehosting.st