CellList - setting selected item background

Hello, I'm trying to set background to selected item in CellList.
Default it's ugly yellow and I want it to be like on GWT Showcase.
This is the way i'm doing this

public interface Resources extends CellList.Resources {
public static final Resources INSTANCE =
GWT.create(Resources.class);

@Source("aaa.png")
ImageResource buzz();

@Source("aa2.png")
ImageResource buzz2();

@Override
@Source("cellBg.png")
public ImageResource cellListSelectedBackground();

}
....
class MyMenu...{
...
CellList<String> cellList_2 = new CellList<String>(new
TextCell(),Resources.INSTANCE);
...
}
And nothing has changed. What's wrong?

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