HeaderPanel masterLayout = new HeaderPanel();
    actionBarPanel.setWidget(new ActionBar());
    VerticalPanel headerPanel = new VerticalPanel();
    headerPanel.setWidth("100%");
    headerPanel.add(buildHeaderPanel());
    headerPanel.add(buildUserInfoPanel());
    headerPanel.add(actionBarPanel);
    masterLayout.setHeaderWidget(headerPanel);
    masterLayout.setFooterWidget(buildFooterPanel());
    masterLayout.setContentWidget(new ScrollPanel(appPanel));
    initWidget(masterLayout);