btn.addClickHandler( new ClickHandler() {
public void onClick( ClickEvent event ) {
final FreeFormLinePopup popup = new FreeFormLinePopup( GuidedRuleEditorResources.CONSTANTS.FreeFormDrl(),
action.getText() );
popup.addOKClickHandler( new ClickHandler() {
public void onClick( ClickEvent event ) {
action.setText( popup.getText() );
textArea.setText( action.getText() );
setModified( true );