We had the wrong layout manager for our JFrame's glasspane. 
I submitted the Mauve test and a patch to Classpath.
Testcase attached.
        
        
        2005-09-19  Anthony Balkissoon  <abalkiss@redhat.com>
        
                * gnu/testlet/javax/swing/JFrame/glassPaneLayout.java:
        New test.        
        
        --Tony