container.setLayout(layout);
mailListPanel = new MailListPanel();
container.add(mailListPanel, new BorderLayoutData(LayoutRegion.CENTER));
mailItemPanel = new MailItemPanel();
BorderLayoutData southData = new BorderLayoutData(LayoutRegion.SOUTH, .5f, 200, 1000);
southData.setSplit(true);
southData.setMargins(new Margins(5, 0, 0, 0));
container.add(mailItemPanel, southData);
}