Android Question CustomListView Background color

Hi, i want to modify the background color of customlistview (the part where i haven't the items), and have the same problem of this Thread:

https://www.b4x.com/android/forum/threads/customlistview-background-color.53363/#post-334402

But i don't understand where i can modify the class customListLiew, because i have the library of customListView.

Thank you for reply.