public void showCloseButtonPanel() { CaptionPanel closePanel = new CaptionPanel(constants.closeTitle()); closePanel.setWidth("185px"); VerticalPanel vp = new VerticalPanel(); vp.setWidth("100%"); vp.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER); closeButton = new Button(constants.close()); vp.add(closeButton); closePanel.setContentWidget(vp); builderContent.add(closePanel); }