toolbar

// Add Toolbar Menus
function buybacks_toolbar() {
	global $wp_admin_bar;

	$args = array(
		'id'     => 'Buybacks',
		'title'  => __( 'Buybacks', 'text_domain' ),
		'meta'   => array(
			'html'     => '',
			'target'   => 'edit.php?post_type=buyback_post_type',
		),
	);
	$wp_admin_bar->add_menu( $args );

}
add_action( 'wp_before_admin_bar_render', 'buybacks_toolbar', 999 );