file_chooser.setMultiSelectionEnabled(true);
file_chooser.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
if(event.getActionCommand() == JFileChooser.APPROVE_SELECTION) {
chosen_folders = new ChosenFolders();
List<File> shared_folders = null;
try {
shared_folders = _config_manager.getSharedFolders();
}catch( Throwable cause ) {