Drag n Drop Button and Drop-down menu PyQt/Qt designer

[mr_lindowsmac]

I would like to know the "best practice" to change the behavior of some buttons to do the following:

I want with a simple click to appear a menu. Or when you drag the same button you could drop it in another and this will "draw" a line connecting them.

I was using the Qt designer and I realize that the buttons properties only the "acceptDrops" property is listed, but I can't make it work. Signals/Slots doesn't list something about dragging or dropping.

So I think that the only way to do it is creating a "Custom Widget" or "reimplementing" a button by code. Maybe the same thing with Signals/Slots

What is the best approach to do so if I don't want to modify the pyuic generated file? Any help will be appreciated.