setHeaderVisible(false);
BorderLayoutData data = new BorderLayoutData(Style.LayoutRegion.WEST, 300);
data.setCollapsible(true);
data.setSplit(true);
data.setFloatable(true);
sidePanel = new SidePanel(config);
sidePanel.setStyleAttribute("z-index", "999");
sidePanel.addStyleName("gwt-only-panel");
add(sidePanel, data);
toolbar = new ActionToolbarLayoutContainer(config.getTopToolbar());