changin a jpanel's content in an applcation

Hi , i have a jpanel which i need to update dynamicly and i can't seem to make it work it won't change sometimes am i doing it right ?

ImageIcon default_image =new ImageIcon(path+"default.png");

JLabel jlabel_default_image =new JLabel(default_image);

jlabel_default_image.setBounds(0, 0, default_image.getIconWidth(), default_image.getIconHeight());

c.weightx = 0.0;

c.gridwidth = 7;

c.gridx = 0;

c.gridy = 1;

add(jlabel_default_image,c);

...

if ((!jcombobox_one_error)&&(!jcombobox_two_error)&&(!jcombobox_three_error))

{

System.out.println("creating new chart");

todayfilename = path+jcombobox_four.getSelectedItem()+END_FILE;

yesterdayfilename = path+jcombobox_five.getSelectedItem()+END_FILE;

LoadData();

final JFreeChart chart = createChart(dataset);

final ChartPanel chartPanel =new ChartPanel(chart);

chartPanel.setPreferredSize(new Dimension(1000, 500));

jpanel = chartPanel;

jpanel.setBounds(0,0,chartPanel.getWidth(),chartPanel.getHeight());

add(jpanel,c);

}

[1461 byte] By [Kernel_77a] at [2007-11-26 22:43:08]