How to avoid dropdown to show diff colors for odd and even rows?

I'm new in SGWT, I'm trying to convert existing code that works with SmartClient Version: v8.2p_2012-07-26/Enterprise Deployment (built 2012-07-26) to SmartClient Version: v10.0p_2015-06-03/Enterprise Deployment (built 2015-06-03). With new version, odd rows in dropdowns have foreground color white while even rows are black. Since background is also black, all even rows just invisible. In old version all rows are white on black an thus perfectly visible. All *.css files are the same in the proprietary code for old & new cases.
How can I show all rows white or how can I change background color using v10.0p?
This is licensed version for a major bank.
Thank you in advance.