How to create a menu with radius and glow effects using the Menu component?

[hualet]

Hi, all. I want to create a popup menu with the default Menu widget, and customize the appearance of it with the MenuStyle shipped with Qt5.3(I want radius for the menu), now I have one problem, I thought the frame property of MenuStyle will be used as the background component of the menu, but it turns out that there’s a white background behind it which I’d like to get rid of, anyone can help me with that?