[flexcoders] PopupButton Background Color

[itdanny2002]

I can't change the background color of 
popupbutton even I set

fillAlphas: 1.0, 1.0, 1.0, 1.0;
fillColors: #000000, #000000;

I want totally black background with a white text  
rather than gradient background. 

Any helps from you ? Many Thanks !