Wordpress Functions: CSS Selector for Page as parent of custom post type

gistfile1.php

//current page filter to shop section
function bracia_add_class_to_wp_nav_menu($classes){
     switch (get_post_type()){
     	case 'course':
     		// we're viewing a custom post type, so remove the 'current_page_xxx and current-menu-item' from all menu items.
     		$classes = array_filter($classes, "bracia_remove_parent_classes");

     		// add the current page class to a specific menu item (replace ###).
     		if (in_array('menu-item-44', $classes)){
     		   $classes[] = 'current_page_parent';
         	}
     		break;
      // add more cases if necessary and/or a default
     }
	return $classes;
}
add_filter('nav_menu_css_class', 'bracia_add_class_to_wp_nav_menu');

function bracia_remove_parent_classes($class){
  // check for current page classes, return false if they exist. helper function
	return ($class == 'current_page_item' || $class == 'current_page_parent' || $class == 'current_page_ancestor'  || $class == 'current-menu-item') ? FALSE : TRUE;