Changing the pane content in a swing frame

hi
I am now trying to implement a GUI, which consist of a JSplitPane including two JScrollPane-s. The left scroll pane is a JTree and the right should display a sequence of JLabels and JTextFields, depending on the selected tree node on the left.
I can't figure out how I can change the content of the right scroll pane with each new selection in the tree.
Here is a part of my code, it seems straightforward, but it displays an EMPTY right JScrollPane.
Do you have any idea why it is empty?
NOTE: maskViewPane is my right JScrollPane, which does not display anything!!!
public void valueChanged(TreeSelectionEvent e) {
        Node node = (Node)tree.getLastSelectedPathComponent();
        if (node == null) return;
        JPanel pane = new JPanel(new GridBagLayout());
              for(int i = 0; i < labelsVALUES.size(); i++) {
                   JLabel labelComponentI = new JLabel(labelsVALUES.get(i));
                   labels.add(labelComponentI);
                   c.insets = new Insets(15, 15, 0, 30);
                   pane.add(labelComponentI, c);
                   JTextField tfComponentI = new JTextField(TextFieldsVALUES.get(i));
                   textFields.add(tfComponentI);
                   c.insets = new Insets(0, 15, 0, 30);
                   pane.add(tfComponentI, c);
         maskViewPane.removeAll(); //NOTE: maskViewPane is my right JScrollPane, which doesn't display anything
         maskViewPane.setViewportView(pane);
         maskViewPane.repaint();
         this.repaint();
    }

Let me introduce to to this wonderful place:
http://forum.java.sun.com/forum.jspa?forumID=57
:)

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