Menu item with a custom url doesn’t show that it's selected when page is open
If you add a menu item with a custom url, when it is clicked it will open the page as expected. However, it doesn’t show that the menu item is selected. See screenshots.
About.png
Categories.png
If looking at the code with firebug, it shows the About as menu-item-type-post_type menu-item-object-page, but Categories as menu-item-type-custom menu-item-object-custom. I think this is where the issue is, but I don’t know where/how to fix.
*Note this is not the default categories page so don't get hung up on that. It could be called anything for that matter.