def METHOD_NAME(self):
    """
    Set with `self.shop_tab.set(main=self, left={index})`
    - index
        1: Monthly shops
        2: General supply shops
    """
    grids = ButtonGrid(
        origin=(340, 93), delta=(189, 0),
        button_shape=(188, 54), grid_shape=(2, 1),
        name='SHOP_TAB')
    return Navbar(
        grids=grids,
        # Yellow bottom dash
        active_color=(255, 219, 83), active_threshold=221, active_count=100,
        # Black bottom dash
        inactive_color=(181, 178, 181), inactive_threshold=221, inactive_count=100,
    )