def __init__(self, item_classes, default_view_id=None, css_classes=[]):
        self._item_classes = []
        self.css_classes = css_classes
        self.default_view_id = default_view_id

        for item_cls in item_classes:
            self.add_item(item_cls)
Initialize the sidebar.
dataset/ETHPy150Open reviewboard/reviewboard/reviewboard/datagrids/sidebar.py/Sidebar.__init__