final SelectionListener listener = createSelectionListenerMenuItem();
viewerEmpty = new Composite(viewerControl, SWT.NONE);
viewerEmpty.setLayout(new FillLayout());
ResponseMessageEditor responseEditor = new ResponseMessageEditor(viewerControl, responseBuilder);
responseEditor.setEditable(false);
MenuItem menuItem = new MenuItem(viewerMenu, SWT.NONE);
menuItem.setText("Response");
menuItem.setData(responseEditor);
menuItem.addSelectionListener(listener);
builderPartCurr = responseEditor;