Add dock at runtime

[Lav]

hi 

(repost)

I am trying to use a button in the menu of my window(addwidget) to add another dock to my dock area. ( see file attached)

The widget gets added and it seems to function but i get the following error:   

AttributeError: 'NoneType' object has no attribute 'type'

Traceback (most recent call last):

..pyqtgraph\dockarea\Dock.py", line 170, in resizeEvent

    self.setOrientation()

..\pyqtgraph\dockarea\Dock.py", line 143, in setOrientation

    if self.container().type() == 'tab':

AttributeError: 'NoneType' object has no attribute 'type'

The error does not happen if the main window is empty ( for the 1st widget you add), but the following ones do the same

can anybody help? 

There is a second  button I added(add widget hack), in which I use a workaround, by creating a temporary area to which I add a widget, and then move it back to the original one.

Am I missing something ? Am trying to find the proper way of doing it!