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Some custom property editors are missing since build 201210050002 (#f704c4ec1055). For example if you open properties sheet of a java file there used to be custom editor (... button) for Extension, Compile Classpath, Runtime Classpath and Boot Classpath.
Also unit tests are affected http://hudson4qe.cz.oracle.com/job/StableBTD-7.3/jdk=JDK%207,label=Solaris11-slave1/11/testReport/org.openide.explorer.propertysheet/EnumPropertyEditorTest/testEnumPropEd/?
Works for me in Product Version: NetBeans IDE Dev (Build 20121015-42c1c4beaffb) Java: 1.6.0_23; Java HotSpot(TM) 64-Bit Server VM 19.0-b09 System: Windows 7 version 6.1 running on amd64; Cp1250; cs_CZ (nb
Fixed in 220154.