@Override
    public void refresh() {
        if (selectedTab != null) {
            if (currentContent != null && currentContent instanceof Refreshable) {
                ((Refreshable) currentContent).refresh();
            }
        }
    }
@return The {@link TabData} instance for the Permissions tab.
stroom-core-client/src/main/java/stroom/entity/client/presenter/LinkTabPanelPresenter.java