In NSView.h: enum { NSViewNotSizable = 0, // view does not resize with its superview NSViewMinXMargin = 1, // left margin between views can stretch NSViewWidthSizable = 2, // view's width can stretch NSViewMaxXMargin = 4, // right margin between views can stretch NSViewMinYMargin = 8, // top margin between views can stretch NSViewHeightSizable = 16, // view's height can stretch NSViewMaxYMargin = 32 // bottom margin between views can stretch }; That should be: NSViewMinYMargin = 8, // bottom margin between views can stretch NSViewHeightSizable = 16, // view's height can stretch NSViewMaxYMargin = 32 // top margin between views can stretch as can be checked with my test application at: ftp://ftp.afaa.asso.fr/users/pascal/develop/gnustep/AutoresizingTest-1.0.1.tar.gz ftp://ftp.afaa.asso.fr/users/pascal/develop/gnustep/AutoresizingTest-1.0.1.readme -- __Pascal Bourguignon__ PGP Key ID: 0xEF5E9966 mailto:[EMAIL PROTECTED] PGP fingerprint: 00 F5 7B DB CA 51 8A AD 04 5B http://www.imaginet.fr/~pjb/ 6C DE 32 60 16 8E EF 5E 99 66