Using QT to change menu bar

[David]

Can anyone tell me how to use QT and python to do the following:
Usually when you do a mouse over an item on any windows menu bar, you
will see a boarder around that item. Now I need to do is to make it
not to have any border, and also highlight the item when I do a mouse
over. Usually only the item in sub menu will be highlighted when you
do a mouse over.

Thank you!