WebListBox Highlighted Row Style ?

Dears, I am new to Xojo, and delight by the tool so far.

Could you please tell me how to change the default dark blue color of a selected row in WebListBox ?

I found how to change the alternate colors but not the highlight color. And this blue does not fit at all my web page style…

Any tips appreciated !

Maybe it is simply not possible, nobody has the answer ?