/**
* Save the model file and inform all listeners. This method is called when the offering duration
* is changed by some means
*/
protected void saveModelAndInform() {
try {
model.saveModelFile();
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "Error saving model file: " + e);
}
for (CourseModelListener lnr : listeners) lnr.modelUpdated();
}