userGroupModel = new GenericEntityModel<Long, UserGroup>(null);
linkDescriptor(userGroupModel).extractSafely(parameters, AdministrationUserGroupPortfolioPage.linkDescriptor());
addBreadCrumbElement(new BreadCrumbElement(new ResourceModel("navigation.administration.usergroup"),
AdministrationUserGroupPortfolioPage.linkDescriptor()));
addBreadCrumbElement(new BreadCrumbElement(BindingModel.of(userGroupModel, Binding.userGroup().name()),
AdministrationUserGroupDescriptionPage.linkDescriptor(userGroupModel)));
add(new Label("pageTitle", BindingModel.of(userGroupModel, Binding.userGroup().name())));
add(new UserGroupDescriptionPanel("description", userGroupModel));