Here's an image of what I have right now, with the MintMenu button (via XfApplet):

And this is what I'd like to achieve... a completely transparent MintMenu button background that still respects the opacity settings of the rest of the xfce panel:

Does anyone know how to do this or what files I'd need to edit? Or is this a missing feature that is yet to be added into the XfApplet or the MintMenu's python files itself?
I realize that this question has been more-or-less asked before, but nobody ever bothered to answer this other guy, 2 years ago (Oct 2011):







