Load an item in the toolbar
    :param import_path: the dotted python path to class or function.
    :param args: For classes, any arguments to pass to the constructor.
    :param kwargs: For classes, any keyword arguments to pass to the constructor.

def load_toolbar_item(import_path, *args, **kwargs):
    """
    Load an item in the toolbar
    :param import_path: the dotted python path to class or function.
    :param args: For classes, any arguments to pass to the constructor.
    :param kwargs: For classes, any keyword arguments to pass to the constructor.
    """
    if isinstance(import_path, (tuple, list)):
        children = [load_toolbar_item(path) for path in import_path]
        return Group(*children)
    elif isinstance(import_path, basestring):
        symbol = _import_symbol(import_path, 'STAFF_TOOLBAR_ITEMS')
    else:
        symbol = import_path

    if inspect.isclass(symbol):
        # Instantiate the class.
        symbol = symbol(*args, **kwargs)

    if not callable(symbol):
        raise ImproperlyConfigured("The {0} in {1} is not callable!".format(import_path, 'STAFF_TOOLBAR_ITEMS'))

    return symbol