Status of Netbeans Platform?

Ok, I figured it out. This is one of those nasty two-factor issues.

In order to fix the erroneous behavior two things must be done. Doing either one of them is not enough.

1) Thanks to Graeme, he found a bug report at https://netbeans.org/bugzilla/show_bug.cgi?id=247077 which basically says you need to either check "Sliding Window Groups" (under Branding/Window System) or put Mode.Sliding.Enabled=true in Bundle.properties

2) You cannot set the system property "winsys.stretching_view_tabs" to true. The reasoning for setting that is explained in http://wiki.netbeans.org/DevFaqCustomizeWindowSystem where I got it from years ago in the infancy of my application.

I had already eliminated the setting of this system property in my test application, that is why doing 1) was enough there.

Many thanks everyone for your help!

Ulrich[/url]