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http://wiki.netbeans.org/TS_60_Java#section-TS_60_Java-TestSuiteJ2SEProject test2 In project's properties - the section Libraries - Compile - Add Library (and also Edit when something selected): a window appears, I select a library and press Enter. NetBeans main window is focused then instead of the project's properties window which is in front but inactive. The only way how to activate it without mouse is to select project's properties again (e.g. from context menu).
*** This issue has been marked as a duplicate of 133359 ***