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Product Version = NetBeans IDE Dev (Build 201109070600) Operating System = Mac OS X version 10.7.1 running on x86_64 Java; VM; Vendor = 1.6.0_26 Runtime = Java HotSpot(TM) 64-Bit Server VM 20.1-b02-383 According to my research, componentOrientation is the property you set to choose the alignment of the tabs for a JTabbedPane. (tabPlacement is for which side it's on, but it defaults to centered.) If I change the property from <default> to <null>, I get a crash (which I have reported separately). If I click on the "...", I'm told that custom editing of this property is not supported.