🚀 go-pugleaf

I'm new to creating GUIs in Jbuilder. This is a very simple GUI which
will display status only with no interaction. Here is the main part of
the code.

private void jbInit() throws Exception {
    this.setSize(new Dimension(437, 466));
    this.setTitle("MultiVis Status");
    this.setEnabled(true);
    this.setVisible(true);
    client_list.addActionListener(new java.awt.event.ActionListener()
{
    public void actionPerformed(ActionEvent e) {
    client_list_actionPerformed(e);
}
});
this.add(panel,BorderLayout.NORTH);
panel.setSize(new Dimension(432, 461));
panel.setVisible(true);
panel.setEnabled(true);
panel.add(client_list);
client_list.setSize(new Dimension(400, 400));
client_list.setVisible(true);
client_list.setEnabled(true);
client_list.setBackground(new Color(46, 108, 108));
client_list.setLocale(new java.util.Locale("en", "GB", ""));
client_list.addItem("this is a test");
client_list.repaint();
//repaint();
}

It displays the Background color of the listview but not the first
element "this is a test". What am I missing?
Thanks for your help.
Gary