form.addWidgetToFormContainer(deleteButton);
processingSpinny.setVisible(false);
processingSpinny.addStyleName(StaticResourceBundle.INSTANCE.coreCss().formSubmitSpinny());
form.addWidgetToFormContainer(processingSpinny);
form.setOnCancelHistoryToken(Session.getInstance().generateUrl(
new CreateUrlRequest(Page.GROUPS, entity.getShortName())));
panel.add(form);