We'll want to do this later after we've sorted out contentType
            
- relates to
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                    JDK-8113879 TitledPane needs to extend Labeled. -           
- Closed
 
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                    JDK-8114200 TitledPane: setTitle(Node) and TitledPane(Node, Node) should be changed to setText(String) and TitledPane(String, Node) -           
- Closed
 
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- 
                    JDK-8091388 Tab and TableColumn needs to implement all the Labeled features via copy/paste -           
- Open
 
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