JFileChooser as save dialog clears text field on change directory

I am trying to implement a basic save dialog using JFileChooser, which initiates with an initial file name, "untitled.txt". However, as soon as the directory is changed by the user, the text field is cleared. I want to ensure that whatever is in the text field when the user changes directories (i.e., untitled.txt may have been changed to something else by the user) stays visible throughout any kind of user navigation. I've tried all sorts of things, but nothing seems to work.
Thanks for your help.

Yes, it very well could be an OS/JDK issue. I'm using jdk 1.5 on Mac OS X (Tiger). Apparently, FileNameExtensionFilter is a jdk 1.6 implementation, because it doesn't work for me.
Here's my code:
JFileChooser fc = new JFileChooser();
String output = outputTextArea.getText();
        String selectedFile = "untitled.txt";
        File file = new File(selectedFile);
        fc.setDialogTitle("Save");
        fc.setMultiSelectionEnabled(false);
        fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        fc.setSelectedFile(file);
        setFileName(file.getName());
        int result = fc.showSaveDialog(this);
        if (result == JFileChooser.CANCEL_OPTION) {
            return;
        } else if (result == JFileChooser.APPROVE_OPTION) {
            file = fc.getSelectedFile();
            if (file.exists()) {
                int response = JOptionPane.showConfirmDialog(null,
                        "Overwrite existing file?","Confirm Overwrite",
                        JOptionPane.OK_CANCEL_OPTION,
                        JOptionPane.QUESTION_MESSAGE);
                if (response == JOptionPane.CANCEL_OPTION) return;
            if (!writeFile(file, output)) {
                setErrorMessage(ERROR5_1); //Just a custom error message and display.
                showErrorMessage();
                return;
        }Is there a workaround if this is an OS or JDK issue?
Thanks again for your help.

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