panel.setSpacing(3);
{
PopupPanel popup = createButton(true, false, panel);
Label partner0 = new Label("AutoHide Partner 0");
Label partner1 = new Label("AutoHide Partner 1");
popup.addAutoHidePartner(partner0.getElement());
popup.addAutoHidePartner(partner1.getElement());
HorizontalPanel hPanel = new HorizontalPanel();
hPanel.setBorderWidth(1);
hPanel.setSpacing(3);