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OutputTabTerm instances don't appear in list of all TopComponents obtained by this: Iterator it = TopComponent.getRegistry().getOpened().iterator(); while (it.hasNext()) { System.out.println("TC="+it.next()); } From the sources I have looked at, I suspect that OutputTabTerm should not implement TopComponentListener because WindowManagerImpl registers a TopComponent by calling topComponentOpened() itself.
Sorry, OutputTabTerm instances actually appear in the list.
It is really user mistake.
Previously CLOSED issue that was mistakenly put into the NEW state... closing again...