Now, to explain the coding of it: the first part (the list) is actually a list of the actual skyboxes, all under a title (e.g. skyboxes and dark). The second part is what calls the lists and places them into the menu you see in Sandbox.  

Now, to explain the coding of it: the first part (the list) is actually a list of the actual skyboxes, all under a title (e.g. skyboxes and dark). The second part is what calls the lists and places them into the menu you see in Sandbox.