PB 12.6 and dockable

Hi,

would someone be able to help me with the following use of the new PB12.6 feature "Docked Windows and Tabbed Document Windows" and opening sheets as documents,  What I try to achieve is

a) open a window within a frame

b) add one or more documents to that window

c) if possible I would like the window to have a menu in it (not in the frame)

d) other items on the wishlist is the possibility to move the window outside the frame and have multiple similar windows open at the same time

Below is a simple picture of the idea

Any help on this would be great.

thanks,

m