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I tried use conversion described by Jirka S. in issue 28145 : NbFrameOperator frame = new NbFrameOperator("Explorer"); JInternalFrameOperator intFrame = new JInternalFrameOperator(frame); but it doesn't work - fails with TimeoutExpiredException, run attached test case.
Created attachment 7878 [details] test case
It was my fault. You need to use a different constructor: new JInternalFrameOperator((JInternalFrame)frame.getSource());
yes, it works fine, thanks. verified