TextField textfield = stringBox.createAdvancedWidget(TextField.class, key);
TextArea textArea = stringBox.createAdvancedWidget(TextArea.class, key);
FileBrowser fileBrowser = stringBox.createAdvancedWidget(FileBrowser.class, key);
fileBrowser.setUpdateAllowed(true);
stringBox.connectSourceListener(this, key);
panel.add(textfield, BorderLayout.CENTER);
panel.add(textArea, BorderLayout.EAST);
panel.add(fileBrowser, BorderLayout.NORTH);