Init on demand.
    :rtype: RootNode

def get_toolbar_root():
    """
    Init on demand.
    :rtype: RootNode
    """
    global _toolbar_root
    if _toolbar_root is None:
        items = [load_toolbar_item(item) for item in appsettings.STAFF_TOOLBAR_ITEMS]
        _toolbar_root = RootNode(*items)
    return _toolbar_root