JTextPane setForeground when HTML is on

I have a JTextPane and I want to change it's foreground sometimes. The problem is, if to switch the ContentType of JTextPane to text/html, my call jTextPane.setForeground(myColor) does not appear. How can I fix that?

SSCCE:

public class TextAreaTest {
    public static void main(String[] a) {
        final JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        final JTextPane textArea = new JTextPane();
        textArea.setEditable(false);
        textArea.setFocusable(false);

        textArea.setText("<html>First line text<br>Second line text</html>");

        final JPanel panel = new JPanel(new FlowLayout());

        final JCheckBox htmlOnOff = new JCheckBox("HTML");
        htmlOnOff.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                textArea.setContentType(htmlOnOff.isSelected() ? "text/html" : "text/plane");
                textArea.setText("<html>First line text<br>Second line text</html>");
            }
        });

        JToggleButton buttonRed = new JToggleButton("Red");
        buttonRed.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                textArea.setForeground(Color.RED);
            }
        });

        JToggleButton buttonGreen = new JToggleButton("Green");
        buttonGreen.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                textArea.setForeground(Color.GREEN);
            }
        });

        JToggleButton buttonBlue = new JToggleButton("Blue");
        buttonBlue.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                textArea.setForeground(Color.BLUE);
            }
        });

        panel.add(htmlOnOff);
        panel.add(buttonRed);
        panel.add(buttonGreen);
        panel.add(buttonBlue);

        ButtonGroup buttonGroup = new ButtonGroup();
        buttonGroup.add(buttonRed);
        buttonGroup.add(buttonBlue);
        buttonGroup.add(buttonGreen);

        JPanel contentPane = new JPanel();
        contentPane.setLayout(new BorderLayout(0, 0));
        contentPane.add(panel, BorderLayout.NORTH);
        contentPane.add(textArea, BorderLayout.CENTER);

        frame.setContentPane(contentPane);
        frame.setUndecorated(true);
        Dimension size = new Dimension(275, 80);
        frame.setSize(size);
        frame.setPreferredSize(size);

        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                frame.setVisible(true);
                System.out.println(frame.getSize());
            }
        });
    }
}

UPDATE#1 I noticed that JLabel is able to do what I want. But I can't use it :(

Solution

Thanks you all, but I've found the answer with myself:

StyledDocument doc = textPane.getStyledDocument();
SimpleAttributeSet attrs = new SimpleAttributeSet();
StyleConstants.setForeground(attrs, myColor);
doc.setParagraphAttributes(0, doc.getLength(), attrs, false);
textPane.setDocument(doc);