Flex Combobox styles

Setting styles to combobox is not just as simple as assigning a 'styleName' property.
The style doesn't apply that easily to the 'prompt' text. By default the font weight is bold and it screws up if the font specified in the styles doesn't have a bold face.

Ideally, it can be like this:
ComboBox {
cornerRadius: 0;
fillAlphas: 1, 1, 1, 1;
fillColors: #ffffff, #ffffff, #ffffff, #eeeeee;
font-family: Avangmb;
font-size: 11;
dropdownStyleName: comboBoxDropdownStyles;
}

.comboBoxDropdownStyles {
fontFamily: AVGARDM;
fontWeight: normal;
}