thanks for your reply jorge, gave that a try but it seems to have no effect.
i'm using the following code ..
_root.myMenuBar.setStyle("borderColor", 0x000000);
or
_root.myMenuBar.setStyle("highlightColor", 0x000000);
with no results - still fully white menus pop up.
is that the correct implementation of that component style? other styles i'm implementing like font family and font size seem to work with that syntax.
i also tried applying the style to the specific menus that appear within the menu bar - also no result. mmmmm.

any thoughts?