@Override
protected void setup() {
HorizontalLayout main = new HorizontalLayout();
getMainWindow().setContent(main);
RichTextArea first = new RichTextArea();
RichTextArea second = new RichTextArea();
RichTextArea third = new RichTextArea();
first.setWidth("150px");
first.setHeight("400px");
second.setSizeFull();
third.setSizeUndefined();
VerticalLayout secondLayout = new VerticalLayout();
secondLayout.setWidth("200px");
secondLayout.setHeight("200px");
secondLayout.addComponent(second);