I am attempting to center text in a JTextPanel as illustrated in the
code fragment below.  Regardless of the value of second arg in the
call to StyleConstants.setAlignment(AttributeSet, int), the text
always starts at the left margin.  Can anyone please help?  Thanks in
advance

        setLayout( new BorderLayout() );
       
        //add a JSlider to BorderLayout.CENTER

        JTextPane instructTextPane = new JTextPane();
        SimpleAttributeSet aSet = new SimpleAttributeSet();
        StyleConstants.setBackground(aSet, Color.gray);
        StyleConstants.setAlignment(aSet, StyleConstants.ALIGN_CENTER);
        instructTextPane.setCharacterAttributes(aSet, true);
        instructTextPane.setBackground(Color.gray);
        instructTextPane.setEditable(false);
        instructTextPane.setText("Move Slider to Adjust Tablet");

        JPanel instructPanel = new JPanel();
        instructPanel.setLayout( new BorderLayout() );
        instructPanel.add(instructTextPane);
        add(instructTextPane, BorderLayout.NORTH);