I am attaching three screenshots in which you can see the appearance of the listview in the designer, the one that then appears when executing the application made with B4J and the one that appears when executing the application with B4A.
The problem only occurs to me when using B4J as long as there are not enough elements to completely fill the customlistbox. It is as if the fixed background color was always white.
Captura3.jpg is the image in which you can see the problem.