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Message: [QUOTE="Jan Burse, post: 5019303"] The javadoc says: "The clientProperty dictionary is not intended to support large scale extensions to JComponent nor should be it considered an alternative to subclassing when designing a new component." So an alternative route would be to subclass: class myTable extends JTable { myType myKey; } Advantage is a little bit more type safety. Since the new field has now a type. So the compiler can do his work when you assign values, and spot errors or do box/unboxing etc.. But subclassing might not always be possible, for example when foreign code is used, and some static factory method irrevocable creates the GUI component. So client data is then a valid resort. Bye [/QUOTE]