Opened Window Selector Dropdown Menu Button？

[PassThePeas]

The closest thing I can think of would be to use this :

Dialog().choices - popup list seperators

For people interested in learning to write a simple popup list here is the finished product, no resources needed, adapt to your own needs, can be bound to the double/middle click events in prefs or put in a button, no resources required, copy and pas…

And instead of building the menu statically, build it dynamically with the list of openend listers.
Bits of CycleListers could be reused, or ones from SwitchLister :

Sudden Power Outage "Erased" Open Listers; Did Not Restore On Restart

I am in (approximately) the same kind of a situation : I use multiple listers, many of which can be opened at the same time. What I ended up doing is this : I created multiples layouts with all the needed tabs in a "default" situation and saved them…

EDIT : This is not a dynamic button exactly, but kind of acts like it.