if (!WadlTreeRoot.containsButton(buttonTreeItems, ApplicationItem.button + WadlXml.representationNode)) {
// add representation button
HorizontalPanel addRepresentationPanel = new HorizontalPanel();
Button addRepresentationButton = new Button(GuiFactory.strings.addRepresentation());
addRepresentationButton.addClickListener(new ClickListener() {
public void onClick(Widget sender) {
if (parentNode instanceof RequestNode) {
((RequestNode) parentNode).addRepresentation(new RepresentationNode(GuiFactory.strings.newRepresentation(), application_xml, (GenericNode) parentNode, ((GenericNode) parentNode).getApplication()));
}
else if (parentNode instanceof ResponseNode) {