Android Question [Solved] b4xCombobox different layout in different apps

Hi
I am testing the b4x Combobox.
When I use it in my code, the opening list Items is white text on black background.
When I test the XUI Views Example, there the list is black text on white background.
In both cases in designer the colors are 'standard'.
1. Why this difference?
2. How can I influence the text- and background-color of the opening list of items?

Thanks in advance!
Thomas