the pdf render format is dynamic at the moment it is a .xdp file.
there are no errors in the java box (ctrl J)
i do get a syntax error near token "'hidden'" on line 7
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it is not essential that the visibility of the table be controlled by a check box. in fact it would be better if the table would autohide itself if no addInstance(1) were selected. but i dont know how to do that either