final LayoutPanel westPanelWrapper = new LayoutPanel();
westPanelWrapper.setStyleName("fill-layout");
final HTML collapseButton = new HTML("<i class='icon-double-angle-left'></i>");
collapseButton.setStyleName("lhs-toggle");
collapseButton.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
boolean collapsed = layout.toggleCollapsedState(westPanelWrapper);
westPanel.setVisible(!collapsed);
if (collapsed)