protected void loadPeriodicsFromFile() throws IOException {
if (m_fileChooser == null) {
m_fileChooser =
new JFileChooser(new File(System.getProperty("user.home")));
m_fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
FileFilter filter = new ExtensionFileFilter(".periodics", "Time series date-derived " +
"periodic attribute definitions (*periodics)");
m_fileChooser.addChoosableFileFilter(filter);
}
int result = m_fileChooser.showOpenDialog(this);